Question

in simple terms, what is an \endosymbiont\?
a cell that can live in many different environments
a cell that lives within another cell
a cell that decompose materials

Explanation:

To determine the correct answer, we analyze the term "endosymbiont". The prefix "endo - " means "within", and "symbiont" refers to an organism in a symbiotic relationship. So an endosymbiont should be an organism (or cell) that lives within another organism (or cell).

• The first option describes a cell with broad environmental tolerance, not related to living within another cell.
• The third option describes a decomposer cell, which is not related to the concept of endosymbiosis.
• The second option, "a cell that lives within another cell", matches the meaning of endosymbiont.

Answer:

B. a cell that lives within another cell