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living organisms change as the abiotic and biotic components in their environment change.
the change from a common ancestor into a number of different species that "radiate out" to inhabit different niches
changes that take place over time int he types of organisms that live in an area.
occurs as the result of a disturbance to an area that already has soil and was once the home of living organisms
a temporary or prolonged shortage of rainfall. Can result in crop failures and livestock deaths
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