Final answer:
A community is the biotic part of an ecosystem. It consists of populations of different species that live and interact in the ecosystem, including their relationships with each other. There are three major types of community relationships: 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 and interact in the ecosystem. It also includes their relationships with each other. All organisms in an ecosystem are connected in one way or another. In fact, populations of different species generally interact in a complex web of relationships. Relationships between species in communities are important factors in natural selection and help shape the evolution of the interacting species. There are three major types of community relationships: symbiosis, predation, and competition.