Which best describes and organism's niche?

An organism's habitat and ability to reproduce determine its niche.

Explanation:

Niche is the response of an organism towards the environmental conditions in the ecosystem. It includes all the living i. e. biotic factors and non living i. e. abiotic factors of the environment which has a direct effect on the organism growth and development. Niche provides information about feeding, reproduction, habitat behavior and interactions with other species.