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Evolution
a change in a population over time real not evolution…
Evolution
a change in a population over time 
Mechanisms
Migration (gene flow): movement of individuals and their genetic information from one population to another
Genetic drift: some individuals leave descendants by chance; very random ex. Ants getting stepped on.
Natural selection: occurs because of variation, heredity, and the environment cannot sustain unlimited population growth
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Macroevolution
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ex: origin of mammals, radiation of flowering plants
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Homologous vs. Analogous
Homologous
characteristics in different organisms that are similar because they were inherited from a common ancestor with the characteristic
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Analogous
convergent evolution-- process in which two distinct lineages evolve a similar characteristic independently of each other
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have separate evolutionary origins, but are superficially similar because they both have experienced natural selection that shaped them that way