Final answer:
A community is the biotic part of an ecosystem and consists of all the populations of all the species that live in the ecosystem. It includes their relationships with each other and can involve symbiosis, predation, and competition.
Step-by-step explanation:
A community is the biotic part of an ecosystem. It consists of all the populations of all the species that live in the ecosystem and their relationships with each other. There are three major types of community relationships: symbiosis, predation, and competition.