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6th Grade - Chapter 4 Vocabulary

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Across
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Practice of choosing plants and animals with desirable traits to reproduce
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Structures that are similar in different species
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The preserved remains or traces of an organism that lived in the distant past
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The extinction of a huge number of species at about the same time
Down
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The process by which the organisms that are best adapted to their environments survive and reproduce
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A timeline covering millions of years and showing the major eras of Earth's distant past
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The death or complete disappearance of a species