Answer:
Your answer is 5
Explanation:
Five types of histones have been identified: H1 (or H5), H2A, H2B, H3 and H4. Hope this helped :)
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They help transmit information between cells of the brain and spinal cord. These are considered as essential fatty acids which are required for optimal health. Unfortunately, they cannot be synthesized in our body. It must be provided in our diet. They are also termed as polyunsaturated fatty acids. They have critical role in the maintenance of structural and functional integrity of the central nervous system. It is particularly important in the development of CNS during fetal life. This must be sustained during the infancy by giving the right and adequate nutrition. This essential fatty acids particularly helps in myelination, which allows conductions of nerve impulse to be fast through saltatory conduction.
Metanephridia differ from protonephridia in that selective reabsorption of materials occurs via cells lining the tubules in protonephridia and via capillaries in metanephridia is true.
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What are the Metanephridia?</h3>
Metanephridia gather the liquid from the celomatic hollow space via a funnel-like shape known as nephrostome. The coelomic fluid enters the tubulus, water and vitamins are reabsorbed, and the metabolic waste inclusive of ammonia, urea, or uric acid is excreted.
The principal distinction among protonephridia and metanephridia is that protonephridia are a community of dead-give up tubules with out inner openings, while metanephridia are a kind of excretory glands with a ciliated funnel starting into the frame hollow space.
Read more about the protonephridia :
brainly.com/question/11072950
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