AP BIOLOGY

Detailed explanation-1: -Because different species often inhabit the same spaces and share-or compete for-the same resources, they interact in a variety of ways, known collectively as symbiosis. There are four main symbiotic relationships: mutualism, commensalism, parasitism, and competition.

Detailed explanation-2: -Community: A biological community consists of all the populations of different species that live in a given area. Community ecologists focus on interactions between populations and how these interactions shape the community.

Detailed explanation-3: -Ecosystem: The collection of all living organisms in a geographic area, together with all the living and non-living things with which they interact. Terrestral Ecosystems (land-based) ecosystems. Natural Community: Populations of different plant and animal species interacting among themselves in an area.