organism: an individual animal, plant, or single-celled life form
population: a community/group of animals, plants, or humans that interact with eachother within a community
community: a group of interdependent organisms of different species growing or living together in a certain area
ecosystem: a biological community of interacting organisms and their physical environment
biosphere: the regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms.
environment: the surroundings or conditions in which a person, animal, or plant lives or operates
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