Bone cells form concentric circles around longitudinal tubes called "Haversian canals" or "osteonic canals".
These canals contain blood vessels, nerves, and lymphatic vessels that supply and nourish the bone tissue. The concentric circles of bone cells are called lamellae, and they surround the Haversian canals in a structure known as an osteonic or Haversian system.
The Haversian system is the basic unit of structure in compact bone, and it allows for the efficient exchange of nutrients and waste products between the bone cells and the blood vessels. The arrangement of the lamellae in the Haversian system also helps to resist compressive and torsional forces, making bone a strong and resilient tissue.
Overall, Bone cells form concentric circles around longitudinal tubes called Haversian canals.
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Part A: Find the age of a rock that contains equal amounts of potassium-40 and argon-40.
Part B: Find the age for a rock that contains three times as much argon-40 as potassium-40.
The age of a rock that contains equal amounts of potassium-40 and argon-40 is approximately 1.3 billion years old. And the age of a rock that contains three times as much argon-40 as potassium-40 is approximately 2 billion years old.
Potassium-40 decays into argon-40 over time, with a half-life of 1.3 billion years. In Part A, if a rock contains equal amounts of both isotopes, it means that half of the original potassium-40 has decayed into argon-40, indicating an age of approximately 1.3 billion years.
In Part B, if a rock contains three times as much argon-40 as potassium-40, it means that three half-lives have passed, indicating an age of approximately 2 billion years. These dating techniques are important for geologists to understand the history of the Earth, as well as the ages of rocks and minerals found within them.
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Which of the following have the thickest layer of peptidoglycan in the cell wall?mycoplasmagram-positive bacteriagram-negative bacteriaL-forms
Gram-positive bacteria have the thickest layer of peptidoglycan in their cell walls.
Which microorganisms are gram-positive?Staphylococcus, a catalase-positive gram-positive cocci, forms clusters, and Streptococcus, a catalase-negative gram-positive cocci, forms chains. S. aureus and S. epidermidis are examples of coagulase-positive staphylococci, while S. epidermidis and S. Along with many other uncommon bacteria, gram-negative infections can be brought on by Klebsiella, Acinetobacter, Pseudomonas aeruginosa, and E. coli.
What makes gram-positive bacteria so special?Gram-positive bacteria show up purple-blue under a microscope because their thick peptidoglycan membrane can contain the dye. The bacteria is known as gram-positive since the test result was positive. Pink-red stains are left by gram-negative bacteria. Since their peptidoglycan layer is thinner, it loses its blue hue.
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what powers abc transporters in the bacterial cell membrane?
The ABC (ATP binding cassette) transporter superfamily is one of the biggest types of transporters8–10. These transporters drive the movement of a wide range of substrates, from ions to macromolecules.
The nucleus, reticulum, vacuoles, cell organelles, and Golgi complex are examples of organelles that are membrane-bound. A bilayer membrane links mitochondria and phloem. The membranes in the various organelles have different molecular make-ups, and each membrane is well suited to the functions it performs.
The phospholipid bilayer, which creates a permanent barrier between two aqueous core, is the membrane's basic structural component. These compartments are the inner and outside of the cell in the case of a plasma membrane.
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What is a protein that binds to an operator and inhibits transcription?
The trp repressor attaches to the operator and prevents the operon from being transcribed. A protein that prevents the expression of one or more genes is known as a repressor in the context of genomics.
The repressor protein inhibits the synthesis of messenger RNA by attaching to the promoter region of the gene(s) (mRNA). A protein known as a repressor binds to an operator site.
The operator in this instance (and numerous others) is a section of DNA that lies just downstream of the RNA polymerase binding site or overlaps with it (promoter). In the absence of an inducer, a repressor protein that binds to the operator gene blocks the transcription of the operon's structural genes.
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30 seconds of exposure to 115 db sound can damage your hearing, but a much quieter 94 db may begin to cause damage after 1 hour of continuous exposure.
Your hearing can be harmed by 115 dB sound for 30 seconds, but a continuous hour of exposure to 94 dB sound can also cause damage. If the noise level is 85 decibel, then harm won't happen for about 30 min.
What four groups of hearing problems are there?All hearing losses can be divided in one of four groups, with severity levels ranging from mild to profound. Auditory neuropathy spectrum disease, mixed (sensorineural or conductive), conductive, or sensorineural are the four distinct types of hearing loss (ANSD).
Is hearing loss reversible?A surgical or medical cure is not available for hearing loss brought on by noise. Hair cells that are damaged cannot grow back. To preserve your hearing, you should take all reasonable precautions. If you suffer hearing loss, then should take action to prevent further damage.
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How many domains contain prokaryotic organisms?
Many domains contain prokaryotic organisms are two domains that are archaea and bacteria.
Prokaryotic cells are a type of cell that does not have a nuclear membrane but has a cell wall in most organisms. The genetic material in these cells is spread out in a nucleus-like body called a nucleotide that is not surrounded by a membrane.
There are two prokaryotic domains, namely bacteria and archaea which live freely and are smaller in size than eukaryotic organisms. How many domains does prokaryotic organisms contain are two domains namely bacteria and archaea. While the structure of the cell wall in prokaryotes consists of peptidoglycan (this compound causes the cell wall to be rigid), lipids (fats), and proteins.
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What is carotid artery stenosis?
Carotid artery stenosis, also known as carotid artery disease, is a condition in which the carotid arteries, the main arteries that supply blood to the brain, become narrowed or blocked.
This narrowing or blockage can be caused by the buildup of plaque or fatty deposits in the artery walls, which can reduce blood flow to the brain and increase the risk of stroke.
Carotid artery stenosis can develop over time and is often associated with conditions such as atherosclerosis, high blood pressure, smoking, and diabetes. Symptoms may include transient ischemic attacks (TIAs), also known as mini-strokes, or a stroke itself, which can cause sudden weakness, numbness, or paralysis of the face, arm, or leg, as well as speech difficulties and visual changes.
Treatment for carotid artery stenosis may include lifestyle changes, medications to reduce the risk of blood clots or lower cholesterol levels, or surgery to remove the plaque or widen the narrowed artery. Early diagnosis and treatment of carotid artery stenosis are important to reduce the risk of stroke and other complications.
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Plants and animals have structures, behaviors, and other traits called adaptations that help them to survive. For example, the gills of a fish are an adaptation for living under water, while lungs are an adaptation to living on land. Switch to the LANDSCAPE tab, choose One location, and check that New York is selected. Click on the deer, squirrel, and oak tree to learn about each organism. Describe one way that each organism is adapted to live in New York’s climate. Organism Adaptation White-tailed deer Eastern gray squirrel Northern red oak
The white-tailed deer is well adapted to living in New York's climate due to its thick fur coat.
What is adaptation?The process of evolution whereby an organism improves its capacity to survive in its habitat or habitats is known as adaptation.
White-tailed deer: Thanks to its thick fur coat, the white-tailed deer is well acclimated to the environment of New York.
The deer's fur provides insulation in the winter and keeps it warm in the chilly weather, while in the summer it offers shade and regulates the deer's body temperature.
Eastern gray squirrel: The Eastern gray squirrel has a thick, fluffy tail that it employs for stability while climbing trees and that also serves to keep it warm in the winter.
Red oak in the north: Red oaks in the north have robust, deep roots that enable them to draw water and nutrients from the soil's depths.
Due to their adaptation, they are better able to survive environmental stresses like drought, which are frequent in New York's climate.
Thus, these are the ways that each organism is adapted to live in New York’s climate.
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How much water is in extracellular fluid?
Extracellular fluid, or fluid found outside of cells, makes for one-third of the body's water content. A 40-litre body contains around 15 litres of . Plasma volume averages 3 litres, or 20%, of this 15 litres of extracellular fluid.
Extracellular fluid (ECF) is the fluid that surrounds cells and is present outside of cells within tissues and organs. The ECF can be further divided into two main compartments: interstitial fluid and plasma. Interstitial fluid is the fluid that surrounds the cells and is present in the spaces between cells within tissues, while plasma is the fluid portion of the blood.
The volume of water in the ECF is constantly changing as water moves into and out of cells and is regulated by various mechanisms, including the action of hormones and the kidneys. In general, the total volume of ECF in the human body is approximately one-third of the body's total water content, with approximately 75% of the ECF being interstitial fluid and 25% being plasma.
The exact volume of water in the ECF can vary depending on factors such as age, sex, and body composition. However, on average, the volume of water in the ECF is approximately 14 liters in a typical adult male, with approximately 10.5 liters of interstitial fluid and 3.5 liters of plasma. In comparison, the volume of water inside cells, known as intracellular fluid, accounts for approximately two-thirds of the body's total water content.
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Do you think alligator farming is good or bad for the environment?Explain.
Answer:
Alligators play an important role in maintaining ecosystem balance. Sitting at the top of the food chain, alligators are apex predators and help keep other animal populations in balance. By digging holes and leaving trails throughout marshes, they create habitats for fish and marine invertebrates.
Explanation:
where is simple cuboidal epithelium found in the body?
Simple cuboidal epithelium: This type of epithelium is usually found in glandular (secreting) tissue and kidney tubules.
Where in the body can you locate cuboidal cells?Cuboidal cells are found in the epithelial layer of ducts such as the pancreas as well as glands such as the salivary gland. Furthermore, cubic cells line the renal tubules .
Where can you locate a basic Finished with bronze and what does it do?Simple cuboidal epithelium is found on the surface of the ovaries, the lining of tubules, the wall of renal tubules, sections of the eyes and gland, & salivary glands. On these surfaces, the cells carry out filtering and secretion.
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the cells in the human body are like little factories. in order to grow, repair, and live, the cells need supplies. which body systems help these cells get the energy they need?
The circulatory, respiratory, and digestive systems all keep your body's cells healthy by supplying them with the nutrition and energy they require to survive.
Which nutritional group supports the development, repair, and upkeep of bodily tissue?Protein. Amino acids, the building blocks of our tissues, are used to make protein. Our food contains protein, which is needed for the maintenance, growth, and repair of human tissue.
What is the name of the substances required for growth and repair?The body requires nutrients for growth, the production of energy, and other bodily processes. The nutrients that are needed in substantial quantities to produce the energy needed to maintain bodily functions and carry out everyday activities are known as macronutrients.
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Dandelions have wind-dispersed seeds that germinate and grow wherever they fall. They are neither clumped, nor evenly dispersed. This is an example of ___ dispersion.
Dandelions have wind-dispersed seeds that germinate and grow wherever they fall. They are neither clumped, nor evenly dispersed. This is an example of random dispersion.
What is Random dispersion?The dispersion pattern or distribution pattern of a population describes the arrangement of individuals of a population within a habitat at a particular point in time, and broad categories of patterns which are used to describe them. The three dispersion patterns are the clumped, random, and uniform pattern.
Random dispersion of the individuals in a population is the randomly distribution of the individuals, without a predictable pattern. An example of random dispersion comes from the dandelions and other plants which have wind-dispersed seeds.
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What are dimples genetic cause by ?
Why are natural killer cells considered to be part of the innate immune response?
Describe the process whereby natural killer cells kill other cells and the role of macrophages in the process.
What treatments or other options does Shanice have to counteract the natural killer cell deficiency?
NK cells, however, are typically regarded as being part of the innate immune defense since they lack antigen-specific cell surface receptors.
What is an antigen specific?When an antigen is recognized by the host cells as a distinct molecular entity and distinguished from other antigens with extreme precision, it is said to have antigenic specificity. The side-chain conformations of the antigen play a key role in antigen specificity.
Are antigens specific or nonspecific?Antigens cause specific immunological reactions to occur. The majority of the time, infections' surfaces contain antigens, which are specific to that pathogen. When exposed to antigens, the immune system either produces antibodies, which are specialized proteins, or cells that go after the pathogen directly.
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What does third spacing of fluid mean?
Third spacing refers to the abnormal accumulation of fluid in the interstitial space, which is the space between cells and tissues outside of blood vessels.
This condition occurs when fluid is trapped in the interstitial space and is unable to return to the circulatory system or be eliminated through normal physiological processes.
Third spacing can occur due to various factors, such as inflammation, infection, trauma, surgery, or certain medical conditions, including heart failure, liver disease, and kidney disease. When third spacing occurs, the fluid accumulation can lead to swelling, or edema, in the affected area, which can be uncomfortable or even painful.
Third spacing can be diagnosed through physical examination or imaging tests, such as ultrasound or CT scans. Treatment of third spacing depends on the underlying cause and severity of the condition. In some cases, conservative measures such as rest and elevation of the affected area may be sufficient.
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what does colonization mean
Colonization is the process by which a group of people establishes and maintains control over a territory or region outside of their original homeland.
This can involve the settlement of people, the imposition of political and economic systems, and the establishment of social and cultural norms.
Historically, colonization has often been accompanied by the exploitation and oppression of indigenous populations, as colonizers seek to exert control over land and resources. This has led to conflicts and struggles for power, as well as the loss of cultural traditions, languages, and ways of life.
Colonization can take many forms, including military conquest, economic exploitation, and religious conversion. It has been a significant force throughout human history, shaping the political, economic, and social structures of societies around the world.
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Evolution is one of the unifying themes of biology. Evolution involves change in the frequencies of alleles in a population. For a particular genetic locus in a population, the frequency of the recessive allele (a) is 0.4 and the frequency of the dominant allele (A) is 0.6.(a) What is the frequency of each genotype (AA, Aa, aa) in this population? What is the frequency of the dominant phenotype?
The incidence of every genotype is listed below, with reference to the question that was asked.
In biology, what does genotype presume?Dictionary of Entry Words. Related to the term "genome," "genotype" inside one meaning refers to the total collection of gene clusters in an organism's cells. But, in a more restricted definition, it can refer to various alleles, or variant versions, of a gene for particular features or qualities.
Given frequency of allele A (p)= 0.6
Frequency of a (q)= 0.4
frequency of a genotype AA (P) = p^2 = 0.6 * 0.6 = 0.36
frequency of a genotype Aa (H) = 2 * p * q = 2* 0.6 * 0.4 = 0.48
frequency of a genotype a (Q) = q^2 = 0.4 * 0.4 = 0.16
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A human cell in g1 of the cell cycle has 23 pairs of chromosomes. the number of unreplicated chromosomes in a human cell following telophase ii of meiosis is?
A human cell in G1 of the cell cycle has 23 sets of chromosomes. The quantity of unreplicated chromosomes in a human cell following telophase II of meiosis is 34.
There are 46 chromosomes in a human cell during G1. DNA has not yet been copied for mitosis, so there are as yet two arrangements of 23 chromosomes for a sum of 46 chromosomes. During the S stage, be that as it may, the DNA in the phone is copied.
During the G1 stage, diploid neurons (chromosomal supplement: 2N; the number of chromosomes: 46; DNA content: 2C) show G1-explicit cell cycle markers (cyclin D and CDK4/6 complex, cyclin E, and CDK2 complex) which are associated with the guideline of G1 stage movement.
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What is the difference between epiphysis and diaphysis?
The epiphysis is the portion of a long bone that initially develops apart from the shaft. The shaft or middle portion of a long bone is known as the diaphysis. It is what gives the long bone its rounded, bulging ends.
What are diaphysis and epiphysis' three key distinctions?The epiphysis is spherical, whereas the diaphysis is long and cylindrical, hence they are different in shape. The epiphysis is made of cartilage, which has a softer texture than the diaphysis, which is made of dense, hard bone.
By diaphysis, what do you mean?The main or middle portion (shaft) of a long bone is called the diaphysis. In addition to bone marrow and adipose tissue, it is composed of cortical bone (fat).
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what is red biotechnology
Red biotechnology, also known as medical biotechnology, is the use of living organisms and bioprocesses in engineering, technology, medicine, and other fields to produce products or services that can help improve human health.
This type of biotechnology focuses on the development of new medical treatments, therapies, and diagnostic tools. Some examples of red biotechnology include the production of vaccines, antibiotics, and gene therapies, as well as the development of new diagnostic tests for diseases such as cancer and Alzheimer's disease.
Additionally, red biotechnology is used in the development of new medical devices and technologies, such as artificial organs and prosthetics. Overall, red biotechnology is a rapidly growing field that is helping to improve the quality of life for people around the world.
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The genome of a virus consists of
(a) DNA
(b) RNA
(c) prions
(d) DNA and RNA
The genome of a virus can consist of either DNA or RNA, but not both. Here option D is the correct answer.
Some viruses contain double-stranded DNA genomes, such as the herpesvirus and poxvirus families, while others contain single-stranded DNA genomes, such as the parvovirus family. Other viruses have RNA genomes, which can be either single-stranded or double-stranded.
Positive-sense single-stranded RNA viruses, such as the poliovirus and the coronaviruses that cause COVID-19, can be directly translated by host ribosomes into viral proteins. Negative-sense single-stranded RNA viruses, such as the influenza virus and the Ebola virus, require a viral RNA polymerase to transcribe the genome into messenger RNA.
Some viruses, such as retroviruses like HIV, have RNA genomes that are reverse-transcribed into DNA after entering host cells. This DNA can then be integrated into the host genome and transcribed along with the host DNA.
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before these proteins can be synthesized, however, what intermediate molecule is synthesized to carry the information coded in the dna?
The majority of genes found in a cell's DNA determine the order of amino acids in proteins; these genes' RNA copies, known as messenger RNA (mRNA) molecules, ultimately control how proteins are made.
What are the protein digestion's intermediary byproducts?Amino acids can be used as a source of energy generation thru the Krebs cycle since digesting them yields metabolic intermediates such pyruvate, acetate CoA, acetoacyl CoA, decarboxylation, or -ketoglutarate.
What chemical acts as an intermediary in metabolism?Acetyl-CoA is a crucial intermediate involved in numerous metabolic pathways, such as cellular respiration, the metabolism of fatty acids, steroids, and amino acids, the synthesis of ketone bodies, and the production of neurotransmitters. It has also been suggested that acetyl-CoA may have an impact on the AMPK signalling pathway.
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Read the statement. [Blank] is a type of medical test that looks for changes in chromosomes, genes, and proteins. Which option correctly completes this sentence?
A Genetic modification
B Genetic screening
C Genetic selection
D Genetic engineering
Genetic screening is a type of medical test that looks for changes in chromosomes, genes, and proteins, option B.
What goes on in genetic screening?Genetic screening is the process of testing for changes or variations in an individual's genetic material, including their chromosomes, genes, and proteins. The purpose of genetic screening is to identify individuals who may be at increased risk for certain genetic disorders, birth defects, or hereditary conditions.
The information gathered from genetic screening can be used to provide individuals and families with important health information and can help guide medical decisions, such as choosing the best treatments or pursuing preventative measures.
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What causes depolarization of a cardiac muscle cell to occur?
This is knοwn as the depolarization period and is caused by the οpening of the sοdium voltage-gated time-dependent channels and this allows sodium ions into the cell.
What is depοlarization vs repolarization?What happens during depolarizatiοn and repolarization? During depolarizatiοn the cell becοmes less negative due to positive charges entering the cell. During repοlarization the cell becomes more negative and returns to resting potential.
What is depolarizatiοn explained simply?Depolarizatiοn is caused by a rapid rise in membrane potential opening of sοdium channels in the cellular membrane, resulting in a large influx of sodium ions. Membrane Repolarization results frοm rapid sodium channel inactivation as well as a large efflux οf potassium ions resulting from activated potassium channels.
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Which of the following vessels gives rise to the common hepatic artery, left gastric artery, and splenic artery?
-intestinal arteries
-celiac trunk
-superior mesenteric artery
-superior epigastric artery
The celiac trunk arteries give rise to the hepatic artery, left gastric artery, and splenic artery.
What artery splits into the common hepatic artery and left gastric artery?The arteries that supply the stomach are principally controlled by the celiac axis. The normal branch of the celiac axis, which arises from the proximal abdominal aorta, are the normal hepatic, splenic, and left gastric arteries.
What are the hepatic artery left stomach and splenic arteries?The branch of the celiac artery are the typical hepatic, left gastrointestinal, and splenic arteries. The liver, gall, stomachs, pancreatic, spleen, and a portion of the duodenum are only a few of the organ that make it up the embryo foregut and are supplied with blood by these branches.
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The enzyme acetylcholinesterase causes acetylcholine to__
A. Bond to actin.
B. Be secreted from the motor end plate.
C. Decompose
D. Form cross-bridges
The enzyme acetylcholinesterase causes acetylcholine to decompose.
The correct answer is C. Decompose.
Acetylcholinesterase (AChE) is an enzyme that breaks down the neurotransmitter acetylcholine (ACh) into its two components, acetic acid and choline.
ACh is a neurotransmitter that is released by nerve cells and binds to receptors on the muscle cells, causing muscle contraction. However, the continuous binding of ACh to the receptors can lead to overstimulation of the muscle cells, which can cause prolonged muscle contraction and potentially dangerous effects.
The action of AChE is to terminate the action of ACh by catalyzing its hydrolysis into acetic acid and choline.
This process is essential for regulating the concentration of ACh in the synaptic cleft, which is the small gap between the nerve terminal and the muscle fiber. Thus, the enzyme acetylcholinesterase causes acetylcholine to decompose.
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Specialized lymphatic capillaries that project into the small intestines are called:a. Chyle.b. Lacteals.c. Lymphatic Trunks.d. Collecting Vessels.
Because lacteals are the term for the specific lymphatic capillaries that extend into to the small intestines and take in dietary fats that are too big to be absorbed by intestinal capillaries.
A lacteal's purpose is unknown.The small intestine's lacteals, or first lymphatics, draw substances from the interstitial space around them, including fluids, electrolytes, and proteins. In addition, and this is crucial, the lacteals move lipids from the intestinal villi's interstitium into the lymph.
For what reason do lacteals absorb fats?Inside the villi in the small intestine, lacteals—lymphatic capillaries—absorb fats and vitamins that are fat-soluble. Fat molecules are taken up by lacteals from the colon because they have a wider diameter than blood capillaries.
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Which of the following best describes how cell division and differentiation work together to produce a complex organism?
A: Cell differentiation increases the number of cells; cell division produces cells with specialized structures and functions.
B: Cell division makes copies of the cell DNA; cell differentiation makes mutations to the cell DNA.
C: Cell division increases the number of cells; cell differentiation produces cells with specialized structures and functions.
D: Cell differentiation makes copies of the cell DNA; cell division makes mutations to the cell DNA.
Which statements characterize simple squamous epithelial tissue?
It encircles the blood vessels and permits osmosis and diffusion on its surface.Sweat, milk, cries, or digestive secretions are produced by this category of exocrine gland.
What is a case when light energy is transformed into chemical energy?For the purpose of photosynthesis, plants use solar light energy.Plants prepare its produce food in the shape sugar carbohydrates during photosynthesis.In order to produce chemical energy, plants transform light energy.
Is photosynthesis an illustration of converting energy?Energy is transformed to hydrogen gas in plant cells through a process called photosynthesis.Plants utilise the chemical energy generated during photosynthesis in their cellular respiration for essential life functions.Energy is changed during both cellular respiration and photosynthesis.
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