The myelin sheath that covers many cns axons is formed by oligodendrocytes.
Oligodendrocytes are type of neuroglia (non-neural cells found in central nervous system) with protective, trophic and supportive role. Their function is to insulate axons (with myelin sheath), in the central nervous system (CNS) which is, equivalent to the function performed by Schwann cells in the peripheral nervous system (PNS).
It allows the scientist to determine the effect of the changed variable , it also allows samples and organisms to be tested under comfortable conditions
Answer:
Chemogeny may be a theory of chemical evolution that depends on the chemical reactions and formation of drugs on the bases of chemical reactions. This theory says that “Life occurs as a results of evolution of inorganic matter”.
In the 1920's Scientists Oparin and Haldane, developed this hypothesis of the chemical origin of life from the primitive atmosphere of the world having matter like methane, ammonia and water. there have been very low concentrations of oxygen thanks to the presence of high temperatures like 5000-60000C. So, these conditions weren't suitable for the free existence of organic compounds, so reactions started happening .
Under conditions like high sunlight and warmth , inorganic matter gets converted to inorganic compounds. And this might end in the storage of organic compounds, which gets more and more concentrated with the passage of many years.
These compounds interact with one another and end in “life”.
So, chemogeny is that the process of chemical evolution of earth and formation of life from pre-existing matter with the assistance of chemical reactions.
Explanation:
Hopefully I was able to help you with the concept. Good luck!
<span>The information that
determines what the organism will be like is the DNA molecule. It is made up of
nucleotides. These nucleotides are linked chains. The four types of bases found in nucleotides are: adenine,
thymine, guanine, cytosine. The order of the bases determines what instructions are contained on the strand. For example, say a strand shows
ATCTT and say that presents in a person who has blue eyes while other eye
colors would be a different code. Wach piece of code determines what the organism will be like based on those pairs.</span>
I think it’s called the passer.
