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4
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a historical sequence of life indicated by fossils found in layers of the Earth's crust
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5
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a characteristic that improves an individual's ability to survive and reproduce in a particular environment.
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6
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Formation of new species
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7
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the process by which species gradually change over time
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8
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An explanation supported by many tests and observations. A widely accepted idea by most of the scientific community
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9
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process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest
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10
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A statement that summarizes a pattern found in nature.
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12
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any difference between individuals of the same species
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13
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type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together
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