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| newly evolved features that do not appear in the fossils of common ancestors. (feathers) |
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| more primitive features such as teeth and tails, that appear in ancestral forms |
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| similar structures inherited from a common ancestor |
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| are the reduced or lesser forms of functional structures in another organism |
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| used for the same purpose and superficially similar in construction but are not inherited from the a common ancestor |
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| pre-birth stage of an organism's developement |
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| darwins study of the distribution of plants and animals around the world |
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| a measure of the relative contribution an individial trait makes to the next generation |
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| adaptations that allow organisms to blend into their environments and hide from peditors |
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| one species evolves to look like another more dangerous species |
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