What is the simplest form of a substance

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Element

Explanation:

An element is the simplest form of a matter. It can not be broken down into a simpler substance without loss of identity.

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d. temperate deciduous forest

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.