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1
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when organisms disappear from the earth.
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3
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the normal differences that are among the individuals of the same species or kind.
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4
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well-supported testable explanation.
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5
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change over time.
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6
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are times when many species of organisms died out at the same time.
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7
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are the remains or any evidence of organisms that have lived in the past.
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8
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or random changes in genes
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9
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is like a characteristic or trait that helps an organism survive in its environment.
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