A. Heat and pressure are correct.
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Answer:
Myelin sheath
Explanation:
Myelin sheath is a protective covering in axons that consist of lipids and proteins, produced by oligodendrocytes. This covering protects the nerve cells from receiving any other electrical impulses not directed to them. It also effeciently speeds the transmission of nerve messages amongst nerve cells in the nervous system.
The answer to the question is 25%
phytoplankton falls on the first trophic level which is are "primary producers", it is because even smallest to smallest creatures like zooplankton feed on phytoplankton.
