Question

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which definition describes endosymbiosis best?
a symbiotic relationship in which one organism lives on the other organism and both organisms benefit
a symbiotic relationship in which one organism lives inside the other and both organisms benefit
a symbiotic relationship in which one organism benefits, while the other organism is harmed

Explanation:

Endosymbiosis is a symbiotic relationship where one organism lives inside another, and both benefit. The first option describes a symbiosis where one lives on the other (not inside), the third is parasitism (one benefits, one is harmed). The second option matches: one lives inside the other, both benefit.

Answer:

The second option: a symbiotic relationship in which one organism lives inside the other and both organisms benefit