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| A group of similar organisms that can mate with each other and produce fertile offspring |
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| A trait that can help an organism survive |
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| The gradual change in a species over time |
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| A well-tested concept that explains a wide range of observations |
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| The process by which individuals are better adapted to their environment and are more likely to survive and reproduce |
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| Any difference between individuals of the same species |
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| The preserved remains or traces of an organism that lived in the past |
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| Rock formed when sediment hardens over millions of years |
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an empty space in a sediment in the shape of an organism or part of an organism |
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| When a mold becomes filled in with harden minerals |
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| The millions of fossils that scientists have collected |
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| A species that have no living members. |
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| A diagram that shows how scientists think different groups of organisms are related. |
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| remains that become buried in sediments and are actually changed into rocks |
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