Which of the following statements is true?

all the populations in an ecosystem form the community.

a habitat represents all the biotic factors in an ecosystem.

the amount of nutrients in soil is an example of a biotic factor.

only one population can live in a habitat at a time.

I think the correct answer from the choices listed above is the first option. The true statement would be that all the populations in an ecosystem form the community. A community or biocoenosis is an assemblage or association of populations of two or more different species occupying the same geographical area and in a particular time.