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4
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A diagram that shows how scientists think different groups of organisms are related
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5
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A process by which individuals that are better adapted to their environment
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6
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A well-tested concept that explains a wide range of observations
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8
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The process of grouping things based on their similarities
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9
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Body parts that are structurally similar in related species
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10
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The struggle among organisms, both of the same and different species
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12
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The comparison of the structures of different organisms
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13
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A scientist who studies fossils
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14
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The gradual change in a species over time
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15
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The disappearance of all members of a species from Earth
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