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| a group of similar organisms that can mate with each other and produce fertile offspring |
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| gradual change in a species over time |
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| trait that helps an organism survive and reproduce |
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| process by which individuals with better adaptations are more likely to survive and reproduce |
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| any difference between individuals of the same species |
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| theory that proposes that evolution occurs slowly and steadily |
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| millions of fossils that scientists have collected |
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| theory that proposes that species evolve rapidly during short periods |
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| diagram that shows how scientists think different groups are related |
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| the preserved remains or traces of an organism that lived in the past |
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| Similar structures that related species have inherited from a common ancestor |
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| A fossil formed when minerals replace all or part of an organism. |
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| A hollow space in sediment in the shape of an organism or part of an organism |
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| a copy of the shape of the organism that made the mold |
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| A technique used to determine which of two fossils is older. |
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| A technique used to determine the actual age of a fossil on the basis of the amount of a radioactive element it contains. |
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| An unstable element that breaks down into a different element |
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| The time it takes for half of the atoms in a radioactive element to break down. |
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| Term used to indicate a species that does not have any living members |
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