Evidence suggests that a voluntary motor exercise that causes significant muscular exhaustion does not cause the overall level of cortical activation to diminish as much as the activation level of the motor neuron pool projecting to the muscle.
What is motor neuron pool?A group of motor neurons that are dispersed throughout a few levels of the spinal cord but whose axons all attach to the same muscle.
It is brought on by an issue with motor neurons, which are brain and nerve cells. These cells progressively cease producing extra energy.
You may be more susceptible to developing motor neuron disease or front temporal dementia if you have a close family who has either of these conditions.
Therefore, during muscle fatigue, shifting of activation center in the brain.
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The center of activation in the brain shift from one location to a different location once neurons within the previous location become played out.
What is Central Fatigue?
Central fatigue is outlined as a deficient drive of motor cortical output attenuating performance or perhaps stopping the activity, whereby restrictive and excitant processes are affected.
Brain is the mass of nerve tissue withinside the anterior stop of an organism.
The brain, along with the spinal cord, constitutes the central nervous system.
The development is that the brain is an organ with inbuilt redundancies: it's multiple motor centers and parallel pathways.
Therefore, it can shift from one location to other during muscle fatigue.
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Which of the following is not an observation or inference on which Darwin's theory of natural selection is based? a. Poorly adapted individuals never produce offspring. b. There is heritable variation among individuals. c. Because of overproduction of offspring, there is competition for limited resources. d. A population can become adapted to its environment over time.
Poorly adapted individuals never produce offspring is not an observation or interference on which Darwin's theory of natural selection is based.
What conclusions about natural selection did Darwin draw from his observations?
Observations made by Darwin that inspired his theory of natural selection include: Overproduction: All species will have more children than they can conceive and raise to adulthood. Variation - Even within a species, there are differences. A trait will be handed down through adaptation if it makes a species more suited to its surroundings.
So, Option A will be correct one.
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An element was missing from the elephant diet to make collagen . Since the elephant's diet consists only of plant material , suggest a source for the elephant to obtain the missing element and make collagen (or any protein
The elephant then needs a supplement of proteins and vitamins in order to be able to make the collagen.
What do you need to make collagen?The term collagen refers to a type of protein that is produced by the body. We know that the body is capable of making proteins when the required materials to make the protein are available in the body.
In this case, the elephant mostly eats plant material which consists of fiber and cellulose. These source would not give the elephant what it needs for the synthesis of collagen or any proteins.
The elephant then needs a supplement of proteins and vitamins in order to be able to make the collagen.
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In a short essay (100-150 words), describe how the structure and electrical properties of vertebrate neurons reflect similarities and differences with other animal cells.
Invertebrate neurons are typically simpler. They are all the same shape, and the neuron cell bodies are organized into what are known as ganglia. Invertebrate neurons lack a myelin sheath, and how information flows is not well understood.
What are properties of neuron?The size, shape, and structure of neurons vary depending on their function and location. Almost all neurons, however, have three essential components: a cell body, an axon, and dendrites.
Neurons in invertebrates are typically simpler. They all have the same shape, and the neuron cell bodies are organized into ganglia. Because invertebrate neurons lack a myelin sheath, it is unclear how information flows.
Vertebrate neurons are far more complex, with trillions of neurons that vary greatly in shape and size.
They do have a myelin sheath and receive input via dendrites and output via axons. The similarities include the use of the neurotransmitter acetylcholine and the transmission of information.
Thus, these are similarities and differences with other animal cells.
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How might biophilia influence us to conserve species and restore ecosystems?
Biophilia influences us to conserve species and restore ecosystems It can act as motivation for the development of an environmental ethic that resolves not to let species become extinct or ecosystems destroyed.
Zoned reserves may additionally provide sustained materials of woodland merchandise, water, hydroelectric electricity, educational possibilities, and earnings from tourism. motion corridors can sell dispersal and decrease inbreeding in declining populations and are especially crucial to species that migrate seasonally.
Habitat fragmentation influences biodiversity with the aid of increasing isolation among populations and reducing powerful populace size, which alters inbreeding and genetic waft within populations, however, a hall also can be dangerous. for example, through allowing the spread of sickness and volunteering for network or college tasks.
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The genome of prokaryotes is contained within the cell's chromosome and plasmids.
a. true
b. false
The statement 'the genome of prokaryotes is contained within the cell's chromosome and plasmids' is true.
In the field of science, prokaryotes can be described as organisms that lack a well-defined nucleus. Other membrane-bound organelles are also absent in a prokaryotic cell.
The bacterial chromosome contains genetic material as a single molecule referred to as a chromosome. This genetic material is present inside the nucleoid region. Prokaryotes have extrachromosomal rings which are referred to as plasmids. The plasmids of a prokaryote are present distinctively from the chromosome of the prokaryote.
The plasmid of prokaryotes has the ability to replicate independently. It is due to the characteristics of a plasmid that it is being used widely today as a vector in recombinant DNA technology.
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The extracellular matrix outside the plasma membrane of animal cells is typically composed of?
The extracellular matrix outside the plasma membrane of animal cells is typically composed of collagen protein and glycoproteins.
Collagen is a structural protein. It is a major constituent of various connective tissues as well as the ECM. The presence of collagen in body as it serves various benefits like: increase in muscle mass, prevention of bone loss, in the tightening of the skin, etc. The protein has high rigidity and resistive power.
Glycoproteins are the type of proteins where the carbohydrate chain is attached to the side chain of amino acids. The process of attached of carbohydrate is known as glycosylation. The examples of glycoproteins are: mucin, transferrin, various hormones, etc.
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In step 4 of glycolysis, an aldolase enzyme splits one 6-carbon fructose-1,6-bisphosphate molecule into two 3-carbon molecules. What type of reaction is this?.
When an aldolase enzyme splits one 6-carbon fructose-1,6-bisphosphate molecule into two 3-carbon molecules, this type of reaction is decomposition.
Decomposition is reaction where one substance is broken down into two or more simpler substances.
From one chemical compound (in this example fructose-1,6-bisphosphate) two new substances (two 3-carbon molecules) are produced (see the picture below).
Glycolysis is metabolic 10 steps process in which sugar glucose (six carbon atoms) is break into two molecules of pyruvate (three carbon atoms). In this process, energy is released. Also, ATP, NADH, and water are products of this metabolic pathway.
During the glycolysis carbon atoms are oxidized.
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If histidine was placed in a solution of ph9, which species would be the dominate form?
The form of histidine at pH nine is the deprotonated form.
What is the form of the histidine?
Histidine is one of the amino acids that exists. Let us recall that amino acids have both carboxylic groups and the amine groups. These are positioned in a way that gives the amino acids their nature. We know that there is the possibilities of the formation of zwitterions in an amino acid.
The form that the amino acids takes depends on the pH. At a higher pH, the carboxylic group is deprotonated while the protonated form remains at a low pH.
Hence, the form of histidine at pH nine is the deprotonated form.
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A protective device to provide safe breathing air to a user in a hostile or dangerous atmosphere is known as?
A protective device to provide safe breathing air to a user in a hostile or dangerous atmosphere is known as respiratory protection.
Respiratory protection- A specific kind of Personal Protective Equipment (PPE) called Respiratory Protective Equipment (RPE) is intended to guard the wearer against breathing in harmful compounds found in the air at work.
Atmosphere- The covering of air that surrounds the Earth is called the atmosphere, and it mostly consists of nitrogen and oxygen. There are traces of other gases in the atmosphere as well, including carbon dioxide, neon, helium, etc.
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If Miller had increased the concentration of NH₃ in his experiment, how might the relative amounts of the products HCN and CH₂O have differed?
There would be more of HCN since there would be higher concentration of the reactant gas that was causes hydrogen.
The Miller-Urey experiment was the simulation of conditions on the early Earth testing the idea that how life, or more specifically the organic molecules, could have been formed by nothing the more than simple the chemical reactions. the Miller's success the validated the theoretical ideas of A.I. The primary significance of the Miller-Urey experiment was that the experiment was significantly proved that origin of the life on the planet was Earth had occurred because of the chemical conditions or actually through the Abiogenesis. During the investigation, the reactants that were used by were water, methane, the ammonia, and by the hydrogen.
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Which of the following is NOT true of plants?
Question 1 options:
A: they are multicellular
B: they undergo photosynthesis
C: they use sunlight to produce food
D: plants are heterotrophic
Or: all of the above are true regarding plants
Which of the following is true regarding plants?
A: plants are unicellular
B: plants are autotrophs
C: plants produce carbon dioxide
D: plants are not producers
Or: none of the above are true of plants
Answer:
all of them
Explanation:
because they all have these characteristics
12 a fox locates its prey, usually a mouse, under the snow by slight sounds the rodents make. the fox then leaps straight into the air and burrows its nose into the snow to catch its next meal. in your calculations ignore the effects of air resistance.
Air resistance represents the forces that are in opposition to the relative motion of an object as it hands through the air. These drag forces act opposing to the oncoming flow velocity, thus delaying the object down.
What is Air resistance? Air resistance is a force created by air. When an object moves through the air, the force acts in the opposite direction. A lorry with a flat front will have high air resistance, whereas a sports car with a streamlined shape will have lower air resistance, allowing the car to travel faster. Air resistance, also known as drag, is a type of friction (a force that opposes motion) that occurs between an object and air. It is the force that an object feels as it moves through the air. The two fixed forces of nature that move on any object on Earth are air resistance and gravity.How to calculate dismiss the effects of air resistance?Given: h = 75cm = 0.75 m
Find: vi, t
The equations we can use
v = vi - 9.81 t
y = vi t - 4.905 t²
There's an additional piece of knowledge that we know. At the peak of the jump, when the fox is at height h, it has zero velocity:
0 = vi - 9.81 tp 0.75 = vi tp - 4.905 tp²
We are now left with two equations and two unknowns. We can solve for vi, the initial velocity.
vi = 9.81 tp
0.75 = 9.81 tp² - 4.905 tp²
0.75 = 4.905 tp²
tp = 0.391 seconds
vi = 9.81 tp = 3.84 m/s
That's one answer. Using the second equation :
y = vi t - 4.905 t²
0 = 3.84 t - 4.905 t²
0 = t (3.84 - 4.905 t)
t = 0, 0.783 s
So the fox leaves the snow at 3.84 m/s and disburses 0.783 seconds in the air.
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6. Carie and Heather wanted to know if the size of a coin will affect the number of drops of
water it can hold. So they used a dropper to place water on a quarter, nickel, and penny.
IV:
DV:
Hypothesis:
PLEASE FILL IN THE BLANK ABOVE!!
The independent variable is the size of the coin. The number of water drops is the dependent variable. control is a coin with no water. the constant is the same dropper / same water.
The cause is the independent variable. Its value is unaffected by the other study variables. The effect is the dependent variable. Changes in the independent variable affect its value.
By presenting both variables in the statement below in a way that makes sense, you may quickly determine which variable in your experiment is the Independent Variable (IV) and which one is the Dependent Variable (DV). "The DV changes as a result of the IV. There is no chance that DV might alter IV in any way.
The variable that changes and on which the dependent variable depends is known as the independent variable. Consequently, the number of water drops the coin might hold depends on its size. The size of the coin is therefore the independent variable.
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heart-shaped bilateral medullary pyramidal infarction as a pathognomonic finding of anterior spinal artery occlusion
Unilateral anterior spinal artery (ASA) occlusion resulting in bilateral medullary pyramidal (BMP) infarction is a periodic and devastating stroke subtype. We present two patients emphasizing the diagnostic and clinical challenges of BMP infarction.
What happens if the anterior spinal artery is injured?
Anterior spinal artery syndrome (ASA) causes motor palsy and dissociated sensory loss below the level of the lesion, as well as bladder dysfunction. Breathing problems may occur when the cervical spine is involved.
What exactly is an anterior spinal artery?The anterior spinal artery is the primary blood supply for the spinal cord. It descends from the foramen magnum level along the anterior surface of the spinal cord.As it continues to descend, the artery establishes contact with other components that enter the spinal canal via the intervertebral foramen. A periodic and lethal stroke subtype is unilateral anterior spinal artery (ASA) occlusion resulting in bilateral medullary pyramidal (BMP) infarction. We present two patients who highlight the diagnostic and clinical difficulties of BMP infarction.To learn more about spinal code, refer to:
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A neuron at rest maintains a _____________ charge due to the presence of a high number of _________ charged ions inside the neuron.
Answer: A neuron at rest maintains a Negative charge due to the presence of a high number of Negatively charged ions inside the neuron.
Explanation:
negative; negatively
Where are the soft tissue structures that can be used to indicate joint effusion located on the ulnar-deviated pa axial wrist projection?
Laterally, the soft tissue structures that can be used to indicate joint effusion are located on the ulnar-deviated PA axial wrist projection. This projection allows for the visualization of the soft tissue structures on the dorsal and volar surfaces of the wrist. The ulnar deviation of the hand during this projection places the soft tissue structures in a more lateral position, allowing for better visualization.
There are a few different structures that can be used to indicate joint effusion on an ulnar-deviated PA axial wrist projection. The most obvious one is the soft tissue shadow, which will be larger than normal if there is excess fluid in the joint. Another structure that can be used is the ulnar styloid, which will be more prominent than usual if there is effusion present. Finally, the articular margins may be less well defined than usual if there is effusion present.
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Which is more important in gauging the intelligence of humans versus other animals?
The more important feature in gauging the intelligence of humans versus other animals is: (c) the ratio of brain weight to body weight.
What is a brain?A brain can be defined as an organ of soft-nerve tissue that is found within the skull of vertebrates (humans), and it's mainly responsible for the coordination of nervous activities, sensation, and intelligence (intellect) in living organisms.
The parts of the brain.Generally, some of the parts of the brain of a living organism (human) include the following:
HypothalamusOptic nerveThe nucleus accumbensCerebellumThe frontal lobeThe brain stemGenerally, human beings are smarter than some animals with even much bigger body weight, brains (brain parts) such as elephants, whales, etc. In this context, we can reasonably and logically deduce that the more important feature in gauging the intelligence of humans versus other animals is the ratio of brain weight to body weight.
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Complete Question:
Which is more important in gauging the intelligence of humans versus other animals?
(a) the size of the cerebral cortex.
(b) the overall size of the entire brain.
(c) the ratio of brain weight to body weight.
(d) the overall weight of the entire brain.
Explain how microscopic and macroscopic anchoring of muscle filaments enables you to bend your elbow.
The development and dissolution of cross-bridges connecting myosin head binding actin ratchet the thin and the thick filaments past one another in response to nervous system motor output. The muscle fibers get shorter as a result of this sliding movement since the filaments are anchored.
Briefing:Muscle contractions attached to a hard endoskeleton are necessary for human body movements. Tendons connect muscles to bones, which are made of fibers that are built up from the sarcomere, a basic structural component. Within the sarcomere, the thin and the thick filaments have different places of attachment. Myosin head and actin cross-bridges develop and break in response to nervous system motor output, ratcheting the thin and the thick filaments past one another. This sliding motion shortens individual muscle fibers because filaments are attached..
Additionally, muscular contraction causes the boy's bones to shift in relation to one another as the fibers themselves are a component of the muscles and are related to bones at either end. Thus, muscle function—such as the bending of either an elbow by contracting the biceps—is made possible by the structural anchoring between muscles and filaments.
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(a) Referring to Figure 56.28 , estimate the average CO₂ concentration in 1975 and in 2012.
The amount of carbon dioxide within the ecosystem has been growing over the past century because of the combustion of fossil fuels.
Carbon dioxide is a greenhouse gas that plays a tremendous position in weather. The growth in carbon dioxide is correlated with modifications in weather that have weather scientists concerned. The graph proven here illustrates the increase in atmospheric carbon dioxide from 1860 to the existing.
Atmospheric carbon dioxide awareness from 1850 to give.
a. Via how lots did the level of carbon dioxide boom between 1880 and the modern-day which causes global warming.
b. What's the percentage boom within the level of carbon dioxide between 1880 and the cutting-edge.
c. Assuming that the overall extent of air inside the atmosphere round Earth is five.
d. Decide the proportion average yearly growth in atmospheric CO₂ from 1960 to the cutting-edge.
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The numerous, bristle-like appendages used by some bacterial cells for adhering to surfaces are called?
The numerous, bristle-like appendages used by some bacterial cells for adhering to surfaces are called fimbriae.
In order words, fimbriae simply refers to those numerous, bristle-like appendages used by some bacterial cells for adhering to surfaces. Please get this cleared stored into your cerebrum that fimbriae are also known or called pili
Whare are bacteria cells?Bacteria cells are those cells which are microscopic ( cells which cannot be seen with the ordinary eye but can be seen only with microscope) and characterized by the presence of just only one cell. This means that bacteria cells are unicellular organisms.
Bacteria cells reproduce a- s- e- xually They are either saprophytes or parasites.Saprophytes are organisms which live and feed on dead decaying plants and animals.
Parasites are organisms which live and feed on another organisms causing harm to them.
So therefore, the numerous, bristle-like appendages used by some bacterial cells for adhering to surfaces are called fimbriae.
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Explain the difference between tools that enhance senses and tools that are used for measurements.
Microscope- A microscope is a device that enlarges an image of a small object to expose details that the unassisted eye cannot perceive. The optical microscope, which employs light waves focused through lenses, is the most used type of microscope.
Lenses- A disk of glass or another transparent material used to concentrate light from an item to create a picture of it.
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Which of the following has the greatest effect on the rate of chemical cycling in an ecosystem? a. the rate of decomposition in the ecosystem b. the production efficiency of the ecosystem's consumers c. the trophic efficiency of the ecosystem d. the location of the nutrient reservoirs in the ecosystem
The rate of decomposition in the ecosystem has the greatest effect on the rate of chemical cycling in an ecosystem.
Decomposition is the process in which complex organic matter is broken down into inorganic building blocks like carbon dioxide, water, and other nutrients by decomposers. The primary location for decomposition activities in the terrestrial environment is the top layer of soil. The breakdown process takes place at the bottom layer (Benthic Zone) of aquatic bodies. If the temperature is raised, the process proceeds smoothly; conversely, if the temperature is low, the breakdown process proceeds slowly. The rate of decomposition is influenced by temperature; colder temperatures slow it down while warmer temperatures speed it up.
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energy given to proteins in the phospholipid layer is required for _______________
Answer:
Trans-membrane proteins.
Explanation:
hope this helps :)(:
Among all nucleated body cells, only B and T cells lose DNA during their development and maturation. In a short essay (100-150 words), discuss the relationship between this loss and DNA as heritable biological information, focusing on similarities between cellular and organismal generations.
Cells go through a transitional phase from stem cells to fully functional immune cells. They pass through a number of transitional and specialization stages, making decisions on the routes that will lead to various blood cell kinds.
What is B cell generation?The generation and maturation of B cells take place in the bone marrow. When lymphoid stem cells differentiate into progenitor B cells, the origin of B cells is established.
In the bone marrow, stromal cells interact to create precursor B cells. The development of pro B cells also depends on the cytokine IL-7's effects.
Concentrating on the parallels between cellular and organismal generations, examine the relationship between this loss and DNA as heritable biological information?B and T lymphocytes are both derived from the same stem cells. Stem cells go through a variety of transitional stages to determine their future (getting converted in B or T cell). Once they've made a decision, they don't change it.
It is well known that DNA carries all of the information required for continuing function and that it is heritable between species. Throughout cell development, B and T cells' DNA experiences a number of rearrangements. DNA that is similar to other DNA no longer exists. For instance, the TCR (T cell receptor) gene rearranges and recombines during the formation of B cells.
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Skin color, fur color, and height are examples of which inheritance pattern?
Mendelian inheritance
incomplete dominance
codominance
polygenic inheritance
Answer:
Polygenic traits have many possible phenotypes (physical characteristics) that are determined by interactions among several alleles. Examples of polygenic inheritance in humans include traits such as skin color, eye color, hair color, body shape, height, and weight.
In preparing a site for surface mining and later restoration, why would engineers separate the topsoil from the deeper soil, rather than removing all soil at once and mixing it in a single pile?
Engineers would separate the topsoil from the deeper soil, rather than removing all soil at once and mixing it in a single pile when preparing a site for surface mining and later restoration because of the difference in the nutrient composition of the different layers of the soil.
What is topsoil?Topsoil refers to the topmost layer of the soil on which plants grow.
The topsoil contains the nutrients which plants require for their growth.
Deeper soil are found beneath the topsoil and lack the necessary nutrients required for plant growth.
Therefore, when preparing a site for surface mining and later restoration, engineers would separate the topsoil from the deeper soil, rather than removing all soil at once and mixing it in a single pile because restoration is aimed at making the soil useful for agricultural activities again. Thus, mixing the soil in one pile will adversely affect the nutrient composition of the soil.
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Suppose instead of the PBDG receptor the researchers had used a receptor specific for a sweetener that humans crave but mice ignore. How would the results of the experiment have differed?
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What statement regarding cancer biology is true? 1. all neoplasms are cancerous 2. cancer refers to a malignant tumor 3. benign growths are cancerous 4. malignant tumors have slow growth
The statement indicating that 'cancer refers to a malignant tumor' is TRUE about this disease (Option 2 is correct).
What are cancer and tumors?Cancer is a disease characterized by uncontrolled cell proliferation and tumors are the mass of cells generated by the development and cancer growth of these malignant tissues.
In conclusion, the statement indicating that 'cancer refers to a malignant tumor' is TRUE about this disease (Option 2 is correct).
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Which nerve cell process receives incoming signals and transmits them to the cell body?.
According to the research, the correct option is dendrites. Dendrites nerve cells receive incoming signals and transmit them to the cell body.
What are dendrites?There are several outputs in the form of small and thin threads that participate in different synapse connections, receiving incoming signals to take it to the new soma and continue the cycle in each nerve structure.
In this sense, these short nerve structures function as extensions of the neuronal body and have the function of receiving the information generated during the synapse.
Therefore, we can conclude that according to the research, the correct option is dendrites. Dendrites nerve cells receive incoming signals and transmit them to the cell body.
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Why is nutrient availability in a tropical rain forest particularly vulnerable to logging?
Most of the nutrients in a tropical rainforest are contained in the trees, so removing the trees by logging rapidly depletes nutrients from the ecosystem. The nutrients that remain in the soil are quickly carried away into streams and groundwater by the abundant precipitation
Tropical Rainforest has has thick vegetation surrounding the region, providing covering for many organisms is found in Africa, South-east Asia, and South Americait has exotic animals such as, monkey, reptiles, parrots, snakes, and leopards , and orchids, bromeliads, vines and ferns that must learn to tolerate shade and absorb sunlightThis biome has four different layers, the trees of this biome are so densely packed that rain falling on the canopy can take as long as ten minutes to reach the ground.Tropical Rainforest t biome is responsible for the majority of oxygen production that is in the air we breathTo know more about tropical rainforest visit : https://brainly.com/question/20406277
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