All the organisms plus the nonliving components of a defined area is a(an):

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An ecosystem is the combination of all the living (biotic) and nonliving (abiotic) components in a defined area. A population refers to a group of individuals of the same species, a community is made up of multiple populations in the same area, a habitat refers to the specific place where an organism lives, and a niche refers to the role and interactions of an organism in its ecosystem.

All the Organisms Plus the Nonliving Components of a Defined