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Evolution

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Across
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____ selection- the theory that evolutionary traits can be explained by competition
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___ evolution- Same biological trait in separate species
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the evolution by which new species are formed
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a science on the development of an embryo
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ability of an organism to survive and reproduce in its environment
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____ structure-Evidence of evolution
Down
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___ drift- The change in the frequency of genes
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______ structure-same ancestor, different function, similar structure
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the end of a species
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_____ evolution- the accumulation of differences between groups which can lead to the formation of new species
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_____ structure- different ancestor, similar function, different structure
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____ Selection- the process by which certain traits make it more possible for an organism to survive.
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____ pool- consists of all genes, including all the different alleles, that are present in a population