Final answer:
A leaf is a biotic factor in an ecosystem.
Explanation:
Biotic factor refers to living components within an ecosystem. In the given options, 'leaf' is a biotic factor because it is a living organism that contributes to the ecosystem. This contrasts with abiotic factors like 'wind' or 'iron gate,' which are non-living elements.
Learn more about Biotic factors here:
https://brainly.com/question/42629244
