| Evolution |
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| • | Darwin's
theory of evolutionary selection holds |
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| that
variation within species occurs randomly and |
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| that
the survival or extinction of each organism is |
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| determined
by that organism's ability to adapt to |
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| its
environment. He set these theories forth in his |
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| book
called, "On the Origin of Species by Means |
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| of Natural
Selection, or the Preservation of |
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| Favoured
Races in the Struggle for Life" (1859). |
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