Scientists have known for centuries that living things change over time.

Drag word(s) below to fill in the blank(s) in the passage.The theory of biological evolution is the unifying-

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for the biological sciences. The mechanism for biological evolution is called-

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, which leads to advantageous traits known as-

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. This mechanism results in changes in the overall-

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composition of-

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Choose an answer from here: theory; populations; individuals; natural selection; mutation; adaptations; communities; hypothesis; genetic

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