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biogeography

the study of where organisms live

continental drift

the process of continents moving

dispersal

the movement of organisms from one place to another

pangaea

one large landmass of continents 255 million years ago

physical barriers

barriers such as water, mountains, and deserts that can limit the movements of organisms

climate

the typical weather pattern in an area over a long period of time

competition

an organism competing for its resources

freshwater ecosystems

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