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Evolution

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