Question

which option correctly describes an element of the endosymbiotic theory? one cell destroys another cell and uses its contents to generate new genetic material. a larger cell engulfed a smaller cell. these cells worked together to live in their environment. two cells fought for resources in an environment causing one to become extinct.

Explanation:

The endosymbiotic theory states that eukaryotic cells evolved from a symbiotic relationship where a larger cell engulfed smaller prokaryotic cells, and they began to live together beneficially. The first option describes destruction, not symbiosis. The third option describes competition leading to extinction, not symbiosis. The second option matches the idea of a larger cell engulfing a smaller one and them working together (symbiosis).

Answer:

B. A larger cell engulfed a smaller cell. These cells worked together to live in their environment.