Question

what is an abiotic factor?

all of these

a living part of an ecosystem

a nonliving part of an ecosystem

a system where living things interact closely with their environment

Explanation:

An abiotic factor is a non - living part of an ecosystem. A living part of an ecosystem is a biotic factor. A system where living things interact closely with their environment is an ecosystem. Since only the option "A nonliving part of an ecosystem" correctly defines an abiotic factor, the answer is not "All of these".

Answer:

A nonliving part of an ecosystem