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Changes in the heritable attributes of populations of organisms over time. The mechanisms of evolution are mutation, migration, drift, and selection.
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How is evolution possible in contemporary humans?
Evolution is possible for the same reasons it has always been possible (and I'll let the other answers' details comment on the mechanics, as they have done already... … I think it's impossible to say to what extent our evolution will now be driven by conscious choices we make about what traits we value vs. the traits that our biology drives us towards. …