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| A group of similar organisms whose members can mate with one another and produce fertile offspring. |
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| A characteristic that helps an organism survive in its environment or reproduce. |
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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 that are better adapted to their environment are more likely to survive and reproduce than other members of the same species. |
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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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| A 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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| A fossil in which minerals replace all or part of an organism. |
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| A fossil formed when an organism buried in sediment dissolves, leaving a hollow area. |
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| A fossil that is a copy of an organism’s shape, formed when minerals seep into a 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. |
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| An unstable particle that breaks down into a different element. |
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| The time it takes for half of the atoms of a radioactive element to decay. |
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| The millions of fossils that scientists have collected. |
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| A species that does not have any living members. |
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| The theory that evolution occurs slowly but steadily. |
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| The theory that species evolve during short periods of rapid change. |
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| Body parts that are structurally similar in related species; provide evidence that the structures were inherited from a common ancestor. |
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| A diagram that shows how scientists think different groups of organisms are related. |
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