Answer:
Cellular Respiration
Explanation:
This is the most known way of Animals and Plants to receive Oxygen.
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<span>They act as a barrier against toxins and other harmful things in the environment. They also are a source of nutrients that are stored. The microenvironment is also favorable due to its high level of hydration and low oxygen levels.</span>
<span>A genetic mutation occurs when there is a permanent change in the nucleotide sequence of the DNA. The error falls in to 3 main groups; Deletion, substitution, or an addition of base pairs. The main reason why mutations are fatal are because of the rapid cell development that can cause cancer.</span>
C. Potassium
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Amino acids I believe sorry if wrong its either A or B
