Final answer:
In biology, a community is the assemblage of different species within an ecosystem, including their interactions and relationships, playing a key role in natural selection and evolution.
Step-by-step explanation:
In biology, a community refers to all the populations of different species that live and interact within a given ecosystem. This includes the relationships and interactions that these species have with one another. Such interactions can take various forms, including symbiosis, predation, and competition, all of which play significant roles in the processes of natural selection and evolution that shape the diversity of life within the community. Additionally, community ecologists focus on how these interactions influence ecological and evolutionary processes impacting population size, distribution, and diversity.