Question

Commensalism is when _______

One species benefits and the other is harmed


Both species benefit


One species benefits and the other is not helped or harmed

Answer 1

The last one.

Step-by-step explanation:

Had this on a test once. I got it right

Answer 2

Commensalism is a symbiotic relationship in which one species benefits while the other is not affected. Parasitism is a symbiotic relationship in which the parasitic species benefits while the host species is harmed.