Answer:
Actually i attended Bilology classes two decades ago. But i still remember that stomata is the outer lining of plants' leaves through which exchange of gas takes place with the surrounding environment.
Answer:
are tiny openings
Explanation:
Stomata are tiny openings or pores in plant tissue that allow for gas exchange. Stomata are typically found in plant leaves but can also be found in some stems. Specialized cells known as guard cells surround stomata and function to open and close stomatal pores. Stomata allow a plant to take in carbon dioxide, which is needed for photosynthesis. They also help to reduce water loss by closing when conditions are hot or dry. Stomata look like tiny mouths which open and close as they assist in transpiration.
Question 1 (1 mark)
Learning goal 1: Which of these statements about matter are
correct?
'Matter includes substances that take up space and have
mass
-Organisms need matter to grow
-Food, air and water are all types of matter
-The Sun provides a constant supply of matter for food
chains
Answer:
Matter includes substances that take up space and have mass.
Which of the following is/are example(s) of lymphocytes? Question 6 options: 1) antibodies 2) B-cells 3) T-Cells 4) T and B-cells
b) cuz(my instinct says so)
B cells and T cells are examples of lymphocytes. So the correct option is D.
What are lymphocytes?Lymphocytes are a kind of white blood cells that are an indispensable part of the immune system. The lymphocytes are produced by the bone marrow.
Most of the lymphocytes produced by the bone marrow enter the blood. The remaining lymphocytes enter the lymphatic system. The lymphatic system includes the tonsils, spleen, and lymph nodes.
B cells are formed from 25% of the new lymphocytes produced and the remaining 75% of cells result in the formation of the T cells.
The T cells and B cells are categorized into two types -
Effector cells are the cells that are activated by antigen simulation. Memory cells are the cells that remember the previous infections and work against them if they ever reenter the system.Thus B cells and T cells are both types of lymphocytes.
Therefore the correct option is D.
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In an aquatic ecosystem, the fishing of a particular fish species increased. This fish species is a secondary consumer in an energy pyramid. The fishing of the species
In an aquatic ecosystem, the fishing of a particular fish species increased. This fish species is a secondary consumer in an energy pyramid. The fishing of the species led to a decrease in its population. In which two ways will this affect the food web?
1 The higher levels in the pyramid will receive more energy.
2 The higher levels in the pyramid will receive less energy.
3 The lower levels in the pyramid will have less predation.
4 The higher levels in the pyramid will receive no energy at all.
5 The lower levels in the pyramid will receive less energy.
Answer:
2 and 3
Explanation:
Just look at a food pyramid and you will see. If there is more fishing of a fish species, that means the population will go down. This means that if the population of fish goes down, the levels in the energy pyramid below the fish will have less predation, since the anything above a level in the food pyramid will eat anything below it. Also, if there's less fish, that means that the higher levels in the pyramid will recieve less energy since there's less fish for them to eat
Answer:
The higher levels in the pyramid will receive less energy.
The lower levels in the pyramid will have less predation.
options 2 and 3
Explanation:
What kind of effect would occur to the biotic factors if the water became contaminated by fertilizer (abiotic factor)?
If the water becomes contaminated by fertilizers, the biotic factors will not be survived properly in that water. Due to contamination, genetic changes and diseases can cause.
What are biotic factors?Biotic factors are those factors that are living or once living. The characteristics of biotic factors are growing and reproducing. These factors are plants, animals, fungi, bacteria, etc.
Fertilizers are chemicals that are used in plants and farming to increase the growth of crops and plants. These fertilizers, in the end, go into water bodies and contaminates them.
These fertilizers are not good for water, as animals drink this water and due to heavy chemicals, these fertilizers cause deformities in animals and plants.
Thus, The biotic factors in the water will not be able to survive effectively if it becomes tainted by fertilizers. Diseases and genetic alterations may result from pollution.
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2. Give ONE possible reason, biotic or abiotic, why the population decreased in 1990
after it had reached its carrying capacity.
Answer:
availability of resources.
Explanation:
Availability of resources is abiotic factor which is responsible for the decrease in population in 1990 because when the population reaches its carrying capacity so the organisms compete with each other and due to limited resources such as food etc the decrease occurs in population. Infection is also occurs when there is high population due to which death occurs and population of organism decreases.
In the brain, the ____________ receives signals of increased blood ____________ (concentration) from various receptors. It responds by stimulating the posterior ____________ gland.
Answer:
I wish I could help I'm sorrrrry:(
One example of qualitative data that can be collected when using a microscope
Answer:
Qualitative and quantitative are two research technique that used in microbiology to collect the data information. These are very useful techniques.
Explanation:
There are several technique has been used in microbiology in collecting data. There are qualitative and quantitative collection of data. Qualitative data tells about data intent in yes or no form. The other techniques such as quantitative technique which provide information about the numerical value of data.
Qualitative technique is used in research would collect data on growth of the bacterial sample on the solid growth of the sample. It is used to assess whether the bacteria in the data is living or dead. It reveals the wealth of the qualitative information of data. The observation of microorganism in microscope get information whether the organism is in propelled motion or its dead.
Difference between inhalation and exhalation???
inhalation: inhaling air (breathing in)
exhalation: exhaling air (breathing out)
Which removes carbon dioxide from the atmosphere, acting as a carbon
sink?
D. Formation of carbonates in the ocean.
(APEX)
Formation of carbonates in the ocean removes carbon dioxide from the atmosphere, acting as a carbon sink. Thus, the correct option is D.
What are the ways of carbon dioxide removal?
Carbon is stored on the planet in the following major sinks as organic molecules in living and dead organisms found in the biosphere, as the gas carbon dioxide in the atmosphere, as organic matter such as carbonates in soil and oceans, in the lithosphere as fossil fuels and sedimentary rock deposits such as limestone, dolomite.
The removal of carbon dioxide is essential because of continued high rates of global emissions. Since industrial revolution, carbon dioxide gas emissions have been building in the atmosphere, creating a warming layer of carbon pollution which is causing climate change.
Therefore, the correct option is D.
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Explain why the average temperature on Earth would be 0 degrees Fahrenheit
Without the layer of greenhouse gases.
Answer:
The average temperature on Earth would be 0 degrees Fahrenheit because there would be nothing holding in the heat inside the atmosphere.
Explanation:
The Greenhouse effect happens when the heat from Earth gets trapped in the atmosphere, making the Earth warmer. Without the Greenhouse gasses, the heat escapes the atmosphere, leaving Earth to being colder.
1. Which of Hubble's findings supported the big bang theory? Circle all that apply. (3) a. Galaxies that are closest to ours are moving more quickly than those located farther away. b. Galaxies tend to move toward each other. c. There are billions of galaxies in the universe, not just one. d. The universe formed from a central point. e. Most galaxies in the universe are moving away from Earth.
Answer: The Universe formed at a central point :)
Explanation:
Answer:
Part B
Explanation:
The water Buffalo is a ? consumer because they eat plants
Answer:
Herbivore (plant eating)
Explanation:
Because they only eat plants, this means water buffalos are herbivores.
Herbivores are a type of consumer that only eat plants.
Answer:
Herbivore
Explanation:
There are five main types of consumers, classified by their diet.
Herbivores: eat plants.
Carnivores: eat meat and other animals.
Omnivores: eat both plants and animals.
Decomposers: break down dead material and waste to return nutrients to the earth.
Scavengers: eat animals that are already dead.
The water buffalo eats plants. Based on the information above, we can assume the water buffalo is a herbivore.
Explain the process of obtaining wool from
sheep.
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The hair of the body of wool yielding animals traps a lot of air spaces between the fibres. Since air is a poor conductor of heat this helps to keep us warm in winter season that's why woollen clothes are worn in winter.
Mainly the wool yielding animals are properly treated and taken care of and this pocess is known as rearing. The wool yielding animals are reared in areas with low rainfall Sheep is one of the most popular wool yielding animals and it has a lifespan of about 10 to 12 years.They eat grass and leaves. Reared shepp are also fed with a mixture of pulses, corn, jowar, Oil cakes and Minerals. In winter they are kept indoors and fed on dry fodder, leaves and grains.☀️ Then, They are sheared......Once the sheep develops a thick coat of hair it is shaved off for getting wool. The removal of wool from sheep is known as shearing. It is done manually with the large razor or with shearing machine. Shearing is usually done during the hot season.━━━━━━━━━━━━━━━━━━━━
With your fragment now in an expression plasmid, you will need to check to ensure that the fragment is in the correct reading frame from the promoter so that a functional enzyme can be made. You will utilize the polymerase chain reaction (PCR) to amplify a section of the plasmid containing your insert so that it can be sequenced. PCR uses a DNA polymerase isolated from a hyperthermophilic bacterial species to synthesize a new DNA strand off a template strand of DNA. You are supplying a template in the form of the plasmid with the inserted fragment. PCR also uses the requirement of DNA polymerase to have a pre-existing primer with an open 3' end for new strand synthesis. You will provide the primers that will bind to specific DNA sequences before and after the inserted fragment and will act as boundaries for what part of the plasmid will be amplified. The resulting short, amplified fragments will be identical in base sequence to the original plasmid templates. Once PCR amplification is complete, you will have enough template fragments to send for DNA sequencing to ensure that you have inserted the genes correctly into the plasmid. Correct insertion will result in the production of an mRNA strand that will have the first gene codon in the correct reading frame for a working enzyme to be produced. Of the following components, which ones are required for the amplification of a specific section of DNA using the polymerase chain reaction? Select all that apply.
a. DNA primers
b. RNA polymerase
c. a strand of RNA to act as a template
d. DNA polymerase that is heat stable
Answer:
The correct answer is - a. DNA primers, and d. DNA polymerase that is heat stable.
Explanation:
In Polymerase chain reaction (PCR) there are many components are required in a overall process but there is two major components that are required for amplification of a specific section of DNA:
a. DNA primers- these are short and strands or sequence of ssDNA, a pair of these sequence acts as the starting site for a new strand which is used to hybridize with the sample DNA and mark the region of the DNA of interest to be amplified.
d. DNA polymerase that is heat stable- PCR technique involves various reaction that are performed at different temperatures. A thermophilic bacteria Thermus aquaticus is used to get this heat stable enzyme, Which lives in hot springs.
Thus, the correct answer is - a. DNA primers, and d. DNA polymerase that is heat stable.
Evidence without ________ increases its reliability. (2 points) bias question repetition replication
Answer:
I would say bias.
Explanation:
bias: prejudice in favour of or against one thing, person, or group compared with another, usually in a way considered to be unfair.
"there was evidence of bias against foreign applicants"
When you are being biased, you are putting your own opinion into what you are doing or you are trying to persuade the person hearing you, reading what you wrote.
Therefore, Evidence without bias increases its reliability.
Which of the following statements are true?
Both viruses and bacteria grow in potentially hazardous foods.
Both viruses and bacteria create spores to help them survive.
Both viruses and bacteria are invisible to the naked eye.
O Thousands of viruses are required to cause a food-borne illness.
Answer:
option C is true statement
Explanation:
both virus and bacteria are disease causing agent and are microscopic and are invisible to naked eye
Two students completed an experiment to determine if pesticide use at local farms was causing fish kills in a local pond. The steps of the
below.
1. Select one location to collect water samples in the pond.
2. Collect a 5-ml water sample at 8 am, 12 pm, and 6 pm for 10 days.
3. Measure the amount of pesticide present in each sample using different measurement tools.
After analyzing their data, the students conclude that pesticide runoff from farms is causing the fish to die in the pond. Which of these stat
why their conclusion is not valid?
Different measuring tools are used to measure the water samples.
The pesticide measurements were the controlled variable
The samples were collected for multiple days at the same times of day.
The time and day of sample collection was not an independent variable.
Answer:
The pesticide measurements were the controlled variable
Explanation:
Human geography is the study of the natural features of the Earth's surface, including
land formation, climate, and currents ,True or false
Answer:
False
Explanation:
Human geography is the branch of geography that deals with humans and their communities, cultures, economies, and interactions with the environment by studying their relations with and across locations.
The study of the interrelationships between people, place, and environment, and how these vary spatially and temporally across and between locations
Answer:
false
Explanation:
An advantage of light microscopes compared to electron microscopes is that light microscopes (4 points)
a
allow you to view the surface of cells in greater detail than electron microscopes
b
have a higher magnification capability because they use natural light
c
allow you to view living cells, while electron microscopes do not
d
have a greater resolution available because they use white light
Answer:
the answer is B.
Explanation:
The biggest advantage is that they have a higher resolution and are therefore also able of a higher magnification
Answer:
C - Allow you to view living cells, while electron microscopes do not
Explanation:
The method used to prepare the specimen for viewing with an electron microscope kills the specimen. Electrons have short wavelengths that move best in a vacuum, so living cells cannot be viewed with an electron microscope.
Evolution can be guided by random processes. What is the effect called when some genotypes are lost in a small population over time, leading to a more homogeneous genetic pool
Answer:
Genetic drift
Explanation:
Genetic drift is defined as the random change in allelic frequencies from one generation to the other.
Genetic drift is an evolutionary mechanism in which the allelic frequencies in a population change through many generations. Its effects are harder in a small-sized population, meaning that this effect is inversely proportional to the population size. Genetic drift results in some alleles loss, even those that are beneficial for the population, and the fixation of some other alleles by an increase in their frequencies. The final consequence is to randomly fixate one of the alleles. Low-frequency alleles are the most likely to be lost. Genetic drift results in a loss of genetic variability within a population.
Genetic drift has important effects on a population when this last one reduces its size dramatically because of a disaster -bottleneck effect- or because of a population split -founder effect-.
Reflect on what was discussed in the video. How would you complete these general sentence stems regarding the nature of science? Note: It’s important to remember that this video only mentions some components of the nature of science! The below sentence stems can contain more characteristics, which we encourage you to discuss and consider. Science can lead to the development of: . It’s important to know that science is:
Answer:
Science can lead to the development of important technologies to maintain and increase our quality of life.
It is important to know that science is a necessary evolutionary resource for the growth and advancement of a nation.
Explanation:
Science is the main responsible for the creation of any and all technology capable of maintaining or creating better levels of quality of life. Through these technologies, better treatments and cures for diseases are developed, better food distribution, better educational methods, better urban infrastructure, better and greater food production, new jobs, among other factors that are very important for the maintenance of life such as improvement of the elements that we already have.
It is important to note that science is responsible for the progress of a nation. Nations that adopt negative and anti-science stances are doomed to ostracism and will be weak, vulnerable and completely out of date.
what is a disadvantage of a 2D model of the digestive system
Answer:
Less biological relevant model and reduce cell to cell interaction.
Explanation:
The two main disadvantages of a 2D model of the digestive system is that it is less biological relevant model and reduce cell to cell interaction. The 2D model does not show high resemblance to reality and this model also fail to show the interactions of two cell surfaces with each other. In short, this model, does not give us complete knowledge about any biological system.
Answer:
Less biological relevant model and reduce cell to cell interaction.
Explanation:
Tetralogy of Fallot is characterized by which of the following?
a. A ventricular septal defect
b. Right ventricular hypertrophy
c. Transposition of the great arteries
d. Obstructed right ventricular outflow
e. An aorta positioned above the ventricular septal opening
Answer:
a. A ventricular septal defect
b. Right ventricular hypertrophy
d. Obstructed right ventricular outflow
e. An aorta positioned above the ventricular septal opening
Explanation:
Tetralogy of Fallot is a combination of four heart defects as the name ‘Tetra’ depicts. The four heart defects include A ventricular septal defect ,Right ventricular hypertrophy ,Obstructed right ventricular outflow and An aorta positioned above the ventricular septal opening.
It usually occurs and discovered at birth and it involves the process whereby the heart isn’t able to pump oxygen-rich blood to other parts of the body. Instead the blood are usually oxygen deficient and could cause a variety of health complications.
describe in your own words, the formation of our solar system.
Answer:
Explanation:
our solar system formed about 4.5 billion years ago from a dense cloud of interstellar gas and dust. The cloud collapsed, possibly due to the shockwave of a nearby exploding star, called a supernova. When this dust cloud collapsed, it formed a solar nebula—a spinning, swirling disk of material.
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Which statement is true regarding cystic fibrosis? It is autosomal-dominant. It affects endocrine glands. It is common in African Americans. It is the most common genetic disease in the United States.
Answer:
The correct answer is - It is the most common genetic disease in the United States.
Explanation:
Cystic fibrosis is the genetic disease that affects the several body system and organ such as lungs and digestive system. This hereditary disease is autosomal recessive.
It is not common in ethnic populations such as African Americans and Asian Americans while in white population of US it is a very common genetic disease as it occurs in one individual in every 2500 to 3500 white infants.
Thus, the correct answer is - It is the most common genetic disease in the United States.
Observations and inferences are important in science. How would you explain the differences between the two words?
Explanation:
when you Observe, you describe what you are seeing at the moment. so observation means seeing.
inference is the result you receive by observation.
for example, "I threw a stick and the dog ran after it and brought it back to me" this is an observation. you don't mention the reason why the dog brought you the stick. you just describe what happened!
but if you say, "the dog was trained to bring back the stick." you are mentioning the reason of the dog's behavior and that's inference.
You explain what you are now observing when you Observe. Therefore, observation is seeing. As a result of observation, you arrive at an inference.
What is a scientific observation?
We use our senses to make observations when doing scientific investigations. When performing a scientific experiment, you use your senses to take note of or observe what is happening. Normally, this will be done using your sense of sight, but depending on the experiment, you could be able to use other senses as well.
In the context of a scientific experiment, it is what it means to observe. In further detail, we might describe observation as the process of knowing and documenting something. Observation simply means observing what is happening through your senses.
This relates to both the awareness of what is occurring and the subsequent documentation of what occurred. In order to avoid having to repeat the experiment over and over, it is crucial for scientists to document what happens throughout the experiment.
Therefore, we explain what you are now observing when you Observe. Therefore, observation is seeing. As a result of observation, you arrive at an inference.
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true or false: dark energy is a "repulsive force"
Answer: True
Explanation: Dark energy is the name given to the mysterious force that is accelerating the rate at which our universe is expanding. ... Some repulsive force is pulling the universe apart and this force was dubbed “dark energy”. Riess and Livio describe the three main hypotheses to explain the nature of dark energy. The leading theory to explain the accelerating expansion is the existence of a hypothetical repulsive force called dark energy. ... "Usually this repulsion is ascribed to a mysterious dark energy that would uniformly permeate the cosmos, but nobody knows what it is nor why it behaves this way," Villata said in an email. Dark energy is believed to be responsible for the expansion of the universe, counteracting gravity, and is considered to be the fifth force acting on matter, after gravity, the electromagnetic force, and the strong and weak nuclear forces.
"Replication forks from the same origin of replication extend __________. __________ DNA strand is used as template for the leading strand at one fork and for the lagging strand at the second fork. New DNA is synthesized from 5' to 3' on the __________."
Answer:
Explanation:
Replication forks from the same origin of replication extend from the beginning of the strand to the end where the enzyme helicase helps to move the replication fork unwinding DNA double helix structure by breaking the hydrogen bonds between the Nitrogenous bases.
DNA strand is used as template for the leading strand at one fork and for the lagging strand at the second fork. New DNA is synthesized from 5' to 3' on the leading strand.
The strand is made continuously forward in the direction of the replication fork while the other strand is made in 3' to 5' direction and been referred to as ozazaki fragments.
Which of the following would cause a decrease in the number of species in an ecosystem?
a decreasing the number of predators
b increasing the food supply
c increasing the produceſ population
d introducing a competing species
Answer:
d) introducing a competing species.
Explanation:
Competition refers to a dynamic partnership in which various species or populations in the environment concurrently seek to utilize the same available resources. Organisms in an ecosystem compete for the same limited nutrients and in the process, one ultimately got an edge over the other. because resources are limited in nature, the population of one species decreases at the expense of the survival of the other.
An ecologist is examining a field with wild flowers. They want to know what types of pollinators carry the most pollen among flowers in the field. In order to determine how much pollen is being carried by each pollinator, the ecologist must examine the entire bodies of multiple organisms, before releasing them back into the wild flower field. What microscope would best assist the ecologist in this task?
Answer:
Dissecting Microscope
Explanation:
The dissecting microscope is also called a stereomicroscope and is the most suitable for making a complete view of the bodies of the organisms shown in the question above. This is because this type of microscope has two objective lenses that capture light and provide a three-dimensional view to the observer, who will be able to fully observe and count the pollen grains in the body of each organism.