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| A characteristic that helps an organism survive in its enviroment |
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| The most specific of the 7 levels of classification; characterized by a group of organisms that can mate with one another to produce fertile offspring |
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| The processs by which the population accumulate inherrited changes over time |
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| The solidfied remains or imprints of a once-living organism |
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A historical sequence of life indicated by fossils found in layers of the Earth's crust.
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| the remnant of a once-useful anatomical structure |
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| a distinguishing quality that can be passed down from one generation to another |
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| The breeding of organisms that have a certain desired trait. |
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| The process by which organisms with the favorable traits survive and reproduce at a higher rate than organisms without the favorable trait. |
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| A change in the order of bases in an organism's DNA ; deletion, insertion, or sunstitution |
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| The period between the birth of one generation and the birth of the next generation |
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| The process by which two populations of the same species become so diffrent that they can no longer interbreed |
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