I dont think it is symbiotic, it is parasitic relationship. They get blood supply of human and dont give anything useful to humans
Best answer is C.<span>It occurs in somatic cells and thus are not usually transmitted to descendants.</span>
The pitfal that writers should avoid is: <span>Providing too much exposition
Exposition is a comprehensive explanation of a certain story or idea.
Backstory should only include information that lead to the actual content of the story/idea. Providing too much exposition would only fed the reades with many pieces of information that irrelevant to the main content.</span>
Water is the most abundant.
