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Change in the properties of a species over generations. ** All living things descended from common ancestors ** All living things can change and give rise to new species
Natural Selection
The differential survival and reproduction of organisms with heritable characteristics that make them better suited to their environment. Natural selection is the driving force of evolution
similar characteristics due to recent common ancestry
similar characteristics not due to evolutionary history, but to environmental pressure (e.g. bats, birds, insects all have wings for flying)

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