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change in a species over time; process of biological change by which descendants come to differ from their ancestors
group of organisms so similar to one another that they can breed and produce fertile offspring
theory that states that natural disasters such as floods and volcanic eruptions shaped Earth's landforms and caused extinction of some species
principle that states that the changes in landforms result from slow changes over a long period of time
theory that states that the geological processes that shape Earth are uniform through time
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