Carbon-14 is the radioactive element which will be best suited for determining the age of the wooden tools which were used by the prehistoric humans during the last ice age.
Radiocarbon dating which is also referred as carbon dating or the carbon-14 dating is a method which is used for the determination of the age of a particular object which contains the organic material by utilizing the different properties of the radiocarbon which basically a radioactive isotope of carbon.
Over time this carbon-14 happens to decay in predictable ways. With the help of the radiocarbon dating researchers can use this decay like a clock which allows these scientist to look into the past and be able to determine the absolute dates of everything ranging from wood to food, poop, pollen, and even dead animals and humans.
Therefore, carbon-14 dating can be used for determining the age of the wooden tools which were used by the prehistoric humans during the last ice age.
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cells use this molecule to store the chemical energy released by the breakdown of food molecules during cellular respiration is?
Classify each description as true of introns only, true of exons only, or true of both introns and exons.a. generally absent from bacterial genomes b. present in eukaryotic genomes c. code for a protein
The proper responses are:
A. Eukaryotic genomes have this gene ==> Exons and introns both
B. Introns are typically lacking from the genomes of bacteria.
C. Exons are the C-section of the final mRNA strand.
D. Exons are the D-code for an amino acid sequence.
E. Before translation, the initial mRNA strand's E was deleted, resulting in introns.
F-present in the DNA utilized as the transcriptional template ==> Exons and introns both
The exons are the portions of an RNA precursor that are conserved in the RNA after splicing and that are present in mature RNA in the cytoplasm in eukaryotic organisms' genes.
Opposing introns are the sections of the RNA precursor that are excised during splicing. The majority of messenger RNAs (mRNAs) that code for proteins have exons. Occasionally, some mRNAs may go through an alternate splicing process.
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Correct Question:
Classify each description as true of introns only, exons only, or both.
A-present in eukaryotic genomes
B-generally absent from bacterial genomes
C-part of the final mRNA strand
D-code for an amino acid sequence
E-removed from initial mRNA strand prior to translation
F-present in the DNA used as the template for transcription
the breakdown of food into nutrients requires secretions from: group of answer choices stomach liver and pancreas salivary glands small intestine all of the above
All of the aforementioned secretions are required for the breakdown of food into nutrients: the small intestine, liver, pancreas, salivary glands, and stomach.
Gastric juice is produced by the stomach and contains hydrochloric acid and digestive enzymes that aid in the breakdown of food. In order to assist in the digestion and absorption of carbohydrates and fats, the pancreas and liver secrete digestive enzymes and bile into the small intestine, respectively. The enzyme amylase is present in saliva, which is produced by the salivary glands, to initiate the breakdown of carbohydrates in the mouth. Digestive enzymes are also produced by the small intestine to degrade the food's remaining nutrients.
As a result, multiple organs and glands must cooperate in order for food to be broken down into nutrients.
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As a nutrition scientist, you have been tasked with developing a new nutrition bar that will be nutritious, portable, and easily digestable. What would be the major substances you would include in this bar to meet these criteria?
Nutrients are the substances which are required by an organism for their survival, growth, and reproduction.
What are Nutrients?A nutrient is a substance which is used by an organism to survive, grow, and reproduce in the environment. The requirement for these dietary nutrients intake applies to all the living organisms present on the planet such as animals, plants, fungi, and protists.
The major substances and the macronutrients and the micronutrients which should be included in the nutrition bar include:
Macronutrients such as:
Carbohydrates: This will be included in cereals, grains and oats
Protein: This is found in the eggs, fishes etc.
Fat: This is found in milk, cheese etc.
These macronutrients helps in providing energy or calories to an individual.
Micronutrients are the nutrients which are required in small amount. The micronutrients include vitamins and minerals, these are needed in smaller amounts and are found in fruits and vegetables.
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Your question is incomplete, most probably the complete question is:
As a nutrition scientist, you have been tasked with developing a new nutrition bar that will be nutritious, portable, and easily digestable. What would be the major substances you would include in this bar to meet these criteria?
There is a lot of debate as to the nutritional standards that should guide elementary school food programs. Based on what you understand about different macronutrients and micronutrients, what would be your recommendations for foods to make available for the students?
what would happen to the sa node if a chemical blocker was used to reduce transport of na into the pacemaker cells?what would happen to the sa node if a chemical blocker was used to reduce transport of na into the pacemaker cells?
If a chemical blocker was used to reduce the transport of sodium into the pacemaker cells of the SA node, it would reduce the rate of spontaneous depolarization and cause the heart rate to slow down.
What is depolarization?Depolarization is a process in which a cell undergoes a change in its membrane potential. It is the result of a decrease in the electrical potential across a cell’s membrane due to an influx of ions. During depolarization, the membrane potential of the cell is reduced and the cell becomes more permeable to ions. This, in turn, causes an increase in the number of ions inside the cell, leading to a net change in the cell’s charge. Depolarization also results in the activation of voltage-gated ion channels, which allow for the rapid influx and efflux of ions, contributing to the depolarization of the membrane. Depolarization is important for the initiation of an action potential, which is a series of electrical signals that are generated by the cell in response to a stimulus.
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in a population of butterflies under strong natural selection large wings are favored. if there is no genetic variation for wing size, what would one expect to occur in the next generation?
If there is no genetic variation in wing size in a population of butterflies under strong natural selection for large wings, then it is unlikely that any significant changes would occur in the next generation.
Natural selection acts on existing genetic variation in a population, favoring traits that increase an organism's ability to survive and reproduce. If there is no genetic variation for a particular trait, such as wing size, then natural selection cannot act on that trait and there will be no changes in the frequency of alleles or traits in the population.
In this case, even though large wings are favored, there is no genetic variation in wing size, so all individuals in the population have the same wing size. This means that there is no variation for natural selection to act upon, and the frequency of alleles or traits in the population will remain the same.
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a cell suspension that is more turbid than another cell suspension (of the same cell type and media) would:
Have a higher cell concentration than the other cell suspension. This is because the higher the cell concentration, the more light is scattered and the more turbid the cell suspension appears.
What is cell?A cell is the basic structural and functional unit of all living organisms. Cells are the smallest unit of life that can carry out all the processes necessary to sustain life, such as growth, metabolism, and reproduction. Cells are made up of a variety of components, including a cell membrane, cytoplasm, and genetic material. Cells are highly organized and can range in size from a few micrometers to several meters in length. Cells are incredibly complex and have specialized functions that allow them to perform specific tasks within the body. Cells can be divided into two main categories: prokaryotic and eukaryotic. Prokaryotic cells lack a nucleus, while eukaryotic cells contain a nucleus and other organelles.
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Help me!!! URGENT!!!
Please complete a minimum of five sentences for the writing prompt and for the questions just choose one please.
Photosynthesis is how the green plants get there food!
How would you explain photosynthesis to a little child?Photosynthesis is a process that plants use to make their own food. It's kind of like cooking, but instead of using a stove, plants use energy from the sun!
Plants have tiny parts called chloroplasts that help them make food. When the sun shines on the leaves, the chloroplasts use the energy from the sun to turn carbon dioxide from the air and water from the soil into a special kind of sugar that the plant can eat. This special sugar is called glucose.
The process of turning sunlight, carbon dioxide, and water into glucose is called photosynthesis, and it's what helps plants grow big and strong! When animals eat plants, they get energy from the glucose, too. That's why plants are a really important part of our food chain!
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which situation occurs after the creation of a new allele?
Answer:
After the creation of a new allele, a process of natural selection can occur where organisms with the new allele may have a better chance of survival and reproducing, leading to a higher frequency of that allele in the population. Over time, this process can result in the evolution of new species or adaptations.
The creation of a new allele can have several effects on the genetic diversity and evolution of a population. It can increase genetic diversity, provide a selective advantage, lead to the evolution of a population, or be neutral and spread through genetic drift.
An allele is a variant form of a gene that arises due to a mutation in the DNA sequence. The creation of a new allele can have several effects on the genetic diversity and evolution of a population.
The creation of a new allele can occur due to several factors, including mutations, genetic recombination, and gene flow. Mutations are the primary source of new alleles, and they can occur spontaneously or due to exposure to mutagens such as radiation, chemicals, or viruses.
Once a new allele is created, it can have several effects on the population. One of the most significant effects is that it increases genetic diversity within the population. Genetic diversity is essential for the survival and adaptation of a population to changing environmental conditions. A diverse population has a higher chance of having individuals with traits that are better adapted to the changing environment, which can help the population to survive and thrive.
The creation of a new allele can also lead to the evolution of a population. Evolution occurs when there are changes in the frequency of alleles in a population over time. A new allele can spread through a population if it provides a selective advantage to the individuals that carry it.
For example, if a new allele provides resistance to a particular disease or allows an individual to access a new food source, individuals with that allele are more likely to survive and pass on the allele to their offspring. Over time, the frequency of the new allele in the population will increase, and it may eventually become the dominant allele in the population.
However, the creation of a new allele does not always lead to a selective advantage. Some new alleles may be neutral, meaning that they do not have any significant effect on the survival or reproductive success of individuals that carry them. Neutral alleles can still spread through a population through genetic drift, which is the random fluctuation of allele frequencies due to chance events. Over time, neutral alleles may become more or less common in a population, but they are unlikely to become the dominant allele.
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in human body, the ______________ is located in the same coronal plane as the anterior superior iliac spine.
In human body, the Pubic tubercle is located in the same coronal plane as the anterior superior iliac spine.
The anterior superior iliac spine (ASIS) is a bony protrusion of the iliac bone that serves as an essential marker in surface anatomy. It refers to the pelvic iliac crest's anterior extremity. It serves as an attachment point for the inguinal ligament and the sartorius muscle.
The tensor fasciae latae muscle joins to the lateral side of the superior anterior iliac spine as well as the iliac tubercle around 5 cm distant.
The anterior superior iliac spine is the anterior extremity of the pelvic iliac crest. This is an important surface marker that may be felt. It serves as an attachment point for the inguinal ligament, sartorius muscle, and tensor fasciae latae muscle.
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What happens if a gene is not expressed?
A different protein is synthesized.
A protein is destroyed.
A protein is shaped differently.
A protein is not synthesized.
Answer: a protein is not synthesized .
Explanation: i misread the answer above me and got it wrong so it showed me the correct answer .
Landlocked nations do not contribute to marine debris.
Please select the best answer from the choices provided
T
F
Landlocked nations do not contribute to marine debris F.
What is the marine debris?Marine debris is any form of human-created waste that is disposed of or discarded and ends up in the marine environment. It can include plastic, metal, glass, rubber, paper, wood, abandoned fishing gear, and other debris. Marine debris is a global problem that has a negative impact on the environment, wildlife, and human health. It can cause the death of marine animals by entanglement, ingestion, or suffocation, and can damage coral reefs, seagrass beds, and other marine habitats. It can also harm fishing and recreational activities, and even contaminate seafood with chemicals and toxins. In addition, marine debris can spread invasive species, and can hinder navigation, communication, and other activities. The main sources of marine debris are land-based sources such as landfills, sewage systems, agricultural runoff, and other sources.
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a stream of charged particles produced by the corona called?
The solar wind is a jet of charged particles that the Sun's corona, or atmosphere, releases space. Electrons, protons, or alpha particles of kinetic energies ranging from 0.5 to 10 keV. the majority of this plasma.
What do the solar wind's charged particles consist of?A stream of energetic, charged particles, principally electrons and protons, traveling through the solar system from the Sun at speeds of up to 900 km/s and a temperature of one million degrees is known as the solar wind (Celsius). Plasma is used to make it.
What is the charged particle stream?A solar radiation is a plasma, a continuous flow or particles (ions or electrons) from of the Sun into to the space between the planets. The solar corona is made up of a highly hot plasma with a temperature exceeding millions of degrees, which allows the particles to escape from the Sun's grasp.
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could natural selection, at any level of organiza- tion, ever cause the extinction of a population or species?
Natural selection can cause the extinction of a population or species.
Natural selection is the process by which organisms with traits that are better suited to their environment are more likely to survive and reproduce. Over time, this leads to the evolution of a species and the adaptation of populations to their environments.
However, natural selection can also lead to the extinction of a population or species if the environment changes in such a way that the traits that were once advantageous become disadvantageous. For example, if a new predator is introduced into an ecosystem, the population of prey species that lacked the necessary adaptations to escape the predator may decline and eventually become extinct.
Another example is the case of inbreeding depression, where populations that are too small and genetically isolated can experience a decline in fitness and an increased risk of extinction.
This can happen when populations are reduced to small sizes due to habitat loss, fragmentation, or other factors, and as a result, they become more susceptible to genetic drift, reduced heterozygosity, and the expression of deleterious recessive alleles.
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Why is replication called semiconservative?
Answer:one of the strands of DNA in each of the two copies of DNA is ancient and conserved while the other is newly produced at the moment of replication.
Explanation:
What process allows water and gases like oxygen and carbon dioxide to move across the cell or mitochondrial membrane?
Answer: Diffusion
Explanation: Diffusion is the movement of a substance
proteus vulgaris has a doubling time of roughly 28 minutes. if an initial population of 500 cells is allowed to grow for 6 hours in ideal conditions, what will be the final population? use three significant figures for your final answer (e.g. 16,796.654 would become 16,800).
Rounding to three significant figures, the final population of Proteus Vulgaris would be approximately 16,800 cells.
To determine the final population of Proteus Vulgaris after 6 hours of growth in ideal conditions, we can use the formula for exponential growth: N = [tex]N0 \times 2^{({\frac{t}{d}})[/tex], where N is the final population, N0 is the initial population, t is the time in minutes, and d is the doubling time in minutes.
First, we need to convert the time from hours to minutes: 6 hours × 60 minutes/hour = 360 minutes. Then, we can plug in the values and solve for N:
N = [tex]500 \times 2^{({\frac{360}{28} })[/tex]
= 500 × 2^12.98
= 500 × 16,797.7
Note that this is an estimate based on ideal conditions, and the actual population may be lower or higher depending on factors such as the availability of nutrients, the presence of predators or competitors, and the impact of any external stresses.
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The Environmental Protection agency mandates that chemical disinfectants state on their labels that items to be disinfected must first be cleaned of gross debris. What "debris" would commonly be encountered in a medical or dental environment that would interfere with effective disinfection?
In a medical or dental setting, where the utmost attention to hygiene is of the essence, common debris that could pose a hindrance to the successful disinfection of surfaces encompasses organic matter like blood, saliva, mucus, and bodily fluids.
These substances, if left unattended, can act as a physical barrier, obstructing the access of disinfectants to the surface and reducing their potency, thereby allowing the proliferation of bacteria.
The failure to remove this debris before administering chemical disinfectants could lead to inadequate cleaning and disinfection, and hence, the potential for harmful microorganisms to flourish.
The presence of organic matter like blood, saliva, mucus, or other bodily fluids on a surface acts as a breeding ground for bacteria, providing them with sustenance to proliferate.
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the fact that a single defective protein causes cystic fibrosis, a multisystemic illness, proves that
An understanding of anatomy and physiology is necessary to comprehend organ systems and organisms.
What exactly does it mean to "use a method that returns the internal environment to its initial state"?Endocrine system hormones regulate blood glucose levels, blood pressure, appetite, and other body processes to maintain homeostasis. The organs that carry out the tasks necessary to maintain homeostasis are referred to as effectors.
The ability to maintain a constant, predictable internal environment is known as homeostasis. The body controls a number of other variables' homeostasis in addition to temperature. For instance, it's crucial to keep your blood's pH, glucose, and other ion concentrations at healthy ranges.
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lipids and fatty acids can form different types of supramolecular structures in water. the most common is what?
The primary lipid found in foods and the body; it is made up of three fatty acids linked to the glycerol backbone. The three-carbon structure of triglycerides.
What do we mean by lipids?Lipids are compounds that are fatty, waxy, or oily. They dissolve in organic solvents but not in polar solvents such as water. Lipids are made up of: Fats and oils (triglycerides) Phospholipids. Waxes. These organic compounds are nonpolar molecules that can only dissolve in nonpolar solvents because water is a polar molecule. These molecules, which are found in foods such as oil, butter, whole milk, cheese, fried foods, and some red meats, can be produced in the human body by the liver.
Lipids are a class of organic substances that include fats and oils. These molecules generate a lot of energy and control a variety of bodily processes.
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Which of the following provides a guided real-life and hands-on agriscience experience?
-FFA
-SAE
-Scholarship applications
-Homework
Supervised Agricultural Experience (SAE) provides a guided real-life and hands-on agriscience experience.
What is Supervised Agricultural Experience (SAE)?
Programs for supervised agricultural experience (SAE) provide students with real-world work-based experiential learning opportunities that are directly applicable to careers in the broad field of agriculture. SAE programmes are teacher-supervised, individualised, hands-on, student-developed activities. An SAE may entail research, a school-based company, student ownership of an agriculture-related business, a placement or internship in an agriculture-related career, or service learning. The SAEs will be distinctive and essential elements of your agricultural education programme, and it will be critical for you to mentor and encourage the students.
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According to the punctuated equilibria model,
A) natural selection is unimportant as a mechanism of evolution.
B) given enough time, most existing species will branch gradually into new species.
C) most new species accumulate their unique features relatively rapidly as they come into existence, then
change little for the rest of their duration as a species.
D) most evolution occurs in sympatric populations.
E) speciation is usually due to a single mutation.
According to the punctuated equilibria model, C) most new species accumulate their unique features relatively rapidly as they come into existence, then change little for the rest of their duration as a species.
How does natural selection relate to punctuated equilibrium?Although coding is justified by the notion of punctuated equilibrium, time and variation still exist. The fact that both natural selection and the Origin of Species included time and variety is in Darwin's favour.
According to scientists, species with shorter evolutionary histories mostly underwent punctuated equilibrium, whereas those with longer histories primarily underwent gradualism. Gradualism is the more gradual process of selection and variation. It is difficult to observe for a brief period of time.
Similar to nonrandom mating, natural selection alters gene frequencies, which upsets the Hardy-Weinberg equilibrium. This happens as a result of specific alleles having an impact on or hindering an organism's ability to reproduce.
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describe the structural characteristics of epithelial tissue that distinguish it from other tissue types.
The structural characteristics differentiating epithelial tissues from others are: (1) cells are placed tightly together as it forms the lining of external surface as well as internal organs; (2) the cells are avascular; (3) the transport of molecules is very selective.
Epithelial tissues are formed of thin layer of cells that line the external surface of the body (skin) and the internal organs. These perform several functions like protection, secretion, absorption, special sensory receptive, etc.
Avascular is the condition inside the body where the organ or part of the body lacks the supply of blood. The example of such parts are: epithelial tissue, cornea of eye, cartilage, nails, etc. This is because these regions get oxygen directly through air.
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What type of tissue produces digestive juices in the stomach?
which of the four major biological macromolecules can be easily identified by the nitrogen base found in its structure
Answer:The macromolecule that can be easily identified by the nitrogen base found in its structure is nucleic acids, specifically deoxyribonucleic acid (DNA)
Explanation:The macromolecule that can be easily identified by the nitrogen base found in its structure is nucleic acids, specifically deoxyribonucleic acid (DNA). DNA is made up of nitrogenous bases, including adenine (A), cytosine (C), guanine (G), and thymine (T), which form the "rings" of the DNA double helix. The specific sequence of these nitrogenous bases encodes the genetic information that controls the development and functioning of all living organisms.
the cow bos primigenius is bred by humans for meat and milk. it has a smaller brain and larger eyes than closely related wild species of ungulates. these traits most likely arose by .
Traits of the cow arose by c)Artificial selection resulted in changes in the lineage which leads to domestic cows because humans wanted animals with high milk output and high muscle content. So, correct option is c.
Well before Darwin and Wallace, individuals were utilizing determination to change the elements of plants and creatures. Ranchers and raisers permitted just the plants and animals with beneficial attributes to duplicate, causing the advancement of homestead stock. This cycle is called counterfeit determination since individuals (rather than nature) select which living beings get to reproduce. Artificial selection is the ID by people of beneficial attributes in plants and creatures, and the means taken to upgrade and sustain those qualities in people in the future.
Artificial selection works the same way as normal choice, then again, actually with regular determination it is nature, not human impedance, that makes these decisions. Artificial selection has for some time been utilized in agribusiness to create creatures and harvests with helpful attributes. The meats sold today are the aftereffect of the specific reproducing of chickens, steers, sheep, and pigs.
Hence,correct option is b.
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(Complete question) is:
The cow Bos primigenius (which is farmed for meat and milk) has a smaller brain and larger eyes than closely related species of wild ungulates. Which of the following statements best describes the process that led to differences between domesticated/farmed cows and their wild relatives?
a) Natural selection resulted in changes in the wild species because humans preyed upon them.
b) Natural selection resulted in changes in the lineage leading to domesticated cows because humans provided food for their cows.
c) Artificial selection resulted in changes in the lineage which lead to domestic cows because humans wanted animals with high milk output and high muscle content.
d) Artificial selection resulted in changes in the lineage leading to domesticated cows because humans wanted animals that would see predators and escape from them.
angela is focusing her study efforts on biology, a subject she knows nothing about. specifically, she is focused on an assignment involving dissection. she is likely to use
A variety of tools and resources to learn about dissection in biology. Here are some of the most common tools and resources that Angela may use: Textbooks, Lab manuals, Online resources, Laboratory equipment and Preserved specimens.
Textbooks: Angela may use biology textbooks to gain a general understanding of the concepts and procedures involved in dissection. These textbooks will provide her with an overview of the anatomy and physiology of the organisms being dissected and explain the steps involved in dissecting them.
Lab manuals: In addition to textbooks, Angela may use lab manuals specifically designed for dissection assignments. These manuals will provide her with step-by-step instructions for performing dissections, as well as diagrams and illustrations to help her understand the process.
Online resources: Angela may use online resources such as videos, tutorials, and articles to gain a deeper understanding of dissection. She may also use online forums and discussion boards to ask questions and get advice from other students or instructors.
Laboratory equipment: Angela will also use a variety of laboratory equipment for her dissection, such as scalpels, scissors, forceps, probes, and dissecting needles.
Preserved specimens: Angela will likely use preserved specimens, such as frogs, worms, or other animals, for her dissection. These specimens will help her to see the anatomy and physiology of the organism up close and to practice the techniques involved in dissection.
Overall, Angela is likely to use a combination of these tools and resources to gain a comprehensive understanding of dissection in biology and to prepare for her assignment.
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individuals of the same species that live, interact and migrate through the same niche and habitat are called a. population b. fauna c. flora d. flora and fauna
Individuals of the same species that live, interact and migrate through the same niche and habitat are called population.
What is species?
Species are groups of creatures that have similar traits and are of hybridization. We humans serve as an example frequently.
Resources cause species biodiversity because migrating organisms lead to it moving from one location to another in quest of nourishment to sustain itself. Resources will be more readily available, which will result in more species and more reproduction.
biodiversity will increase as more creatures move into the area.
On the other hand, a lack of resources leads to a decline in species variety and a slower rate of reproduction.
A group of creatures known as a biological species can procreate with one another in the wild and give birth to healthy offspring.
Simply said, species are different sorts of life. For instance, there is only one species of human, Homo, according to science.
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Golgi Body
Cell Membrane
Nuclear Membrane
O
Ribosomes
Vacuoles
Cross-Section of an Animal Cell
The Golgi body is a cellular organelle that is responsible for modifying and processing proteins and lipids that are produced by the cell. It plays a critical role in the transport and packaging of these molecules for delivery to their appropriate destinations within or outside the cell.
The cell membrane, also known as the plasma membrane, is a thin, semi-permeable barrier that surrounds & encloses the contents of the cell.
The nuclear membrane, also known as the nuclear envelope, is a double-layered structure that surrounds the cell's nucleus, separating it from the rest of the cell.
Ribosomes are small organelles within the cell that are responsible for the synthesis of proteins. They read genetic information encoded in RNA & use it to assemble the correct sequence of amino acids into a functional protein.
Vacuoles are membrane-bound sacs within the cell that play a variety of roles including storage of nutrients, water, and waste products.
Cross-Section of an Animal Cell, this refers to a view of an animal cell as if it were cut in half, showing its internal structure.
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populations that emerged from the k-pg extinction (extinction of the dinosaurs) were markedly different from their pre-disaster communities. this is called:
There is proof that an asteroid strike was the main culprit. Large-scale volcanic eruptions have changed the climate as well as dramatic changes to it that happened over millions of years.
After the asteroid, why long did dinosaurs survive?In 9 months, the darkness brought on by the dinosaur-killing asteroid ended all life on Earth. Plants and animals perished as the sunlight faded. Dark days — literally — followed the asteroid catastrophe that wiped off non-avian dinosaurs.
Which three hypotheses explain the demise of dinosaurs?Following one of the biggest mass extinctions in the history of our planet, caused by a devastating asteroid impact, extensive volcanic activity, climate change, and other factors, most dinosaur lineages vanished by roughly 66 million years ago, according to paleontologists.
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