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| a population can change over generations if individuals that possess certain heritable traits leave more offsrping than other individuals. |
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| An accumulation of inherited characteristics that enhance organisms ability to survive and reproduce in specific environments. |
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| A change over tiem in the genetic composition of a population. |
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| The branch of biology concerned with naming and classifying organisms. |
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| Remains or traces of organisms from the past |
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| They are formed from the sand and muc that settle to the bottom of seas, lakes, and marshes. |
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| Speculating that each boundary between strata represents a catastrophe, such as a flood or drought, that destroyed many of the species living at that time. |
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| the idea that profound change can take place through the cumulative effect of slow but continous processes. |
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| The same geologic processes are operating today as in the past, and at the same rate. |
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| Descent with modification |
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| a phrase that summarized Darwin's view of life. |
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| Human have modified other species over many generations by selecting and breeding individuals t hat possess desired traits. |
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| Certain characteristics in related species that have an underlying similairity even though they may have very different functions. |
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| the arms, forelegs, flippers, and wings of different mammals that repsent variations on a structural theme that was present in their common ancestor. |
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| Organs that are remnants of structures that served important functions in the organism's ancestors. |
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| Darwin's observations of the geographic distribution of species |
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| species of plants and animals that are found nwhere else in the world. |
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