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Ecology

Across
An individual animal, plant, or single-celled life form
A group of organisms of the same species that live in the same area and interbreed
The branch biology that deals with the relations of organisms to one another and to their physical surroundings.
The non-living parts of the environment
Collection of all the organisms that live in a particular place, together with their nonliving environment
Group of similar organisms that can breed and produce fertile offspring
Down
A group of different populations that live in the same area
Part of the earth in which life exists including land, water and air or atmosphere
The living parts of the environment
Areas with similar climate and conditions