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| The theory that Earth was one large landmass or supercontinent called Pangea, which eventually split apart. |
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| The process by which individuals that are better adapted to their environment are more likely to survive, reproduce, and pass on their genes. |
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| a well-tested concept that explains a wide range of observations, but is not proven |
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| the gradual or slow change in a species over time |
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| a group of similar organisms that can mate with each other and produce offspring that are fertile |
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| any difference between individuals of the same species |
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| Observations lead this person to the development of the theory of evolution by natural selections |
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| a British naval ship that sailed from England on a 5-year trip around the world and was famous for going to Galapagos Islands |
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| a physical or behavioral trait that helps an organism survive and reproduce |
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| a relative that closely relates organisms in an evolutionary branching tree |
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| formed when a group of individuals remains separated from the rest of its species long enough to evolve different traits |
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| a species that does not have any living members |
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