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(ecology) the status of an organism within its environment and community (affecting its survival as a species)
an increase in the average temperature of the earth's atmosphere (especially a sustained increase that causes climatic changes)
the layer of ozone gas in the upper atmosphere that protects Earth from some of the Sun's radiation
to put wastes, garbage, or the like, through a cycle of purification and conversion to useful products
organism that relies on other organisms for its energy and food supply; also called a heterotroph
(ecology) the gradual and orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is established
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