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Unit 3 Vocabulary

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Across
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the remains of an organism that lived long ago
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when humans breed organisms that have certain desired traits
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Change over time
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a species that has died out completely
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historical sequence of life indicated by fossils found in layers of Earth's crust
Down
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the process by which individuals that are better adapted to their environment survive and reproduce
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characteristic that allows an organism to survive in its environment
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differences among organisms
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group of organisms that are closely related and can mate to produce fertile offspring
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a genetically determined characteristic