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a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...

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can be broken down, in a reasonable amount of time, into its base compounds by micro-organisms...

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the variation of life forms within a given ecosystem; often used as a measure of the health of...

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variety of different plant and animal species in an ecosystem

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all the ecosystems on the Earth, all the species within these ecosystems and the genetic...

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