Question

a collection of populations of different species that interact is called a(n)...
a. organism
b. population
c. community
d. ecosystem

Explanation:

In ecology, a community is defined as a collection of populations of different species that interact with one another. An organism is a single living entity, a population is a group of the same - species individuals, and an ecosystem includes both biotic (living) and abiotic (non - living) components.

Answer:

C. Community