A biogeographic realm is a large, distinct region of the Earth's surface that is characterized by specific ecological and climatic conditions and is home to particular plants and animals. These realms are typically defined by the distribution of species, evolutionary history, and geographical barriers that influence the biodiversity and organic life within them. Biogeographic realms are often used in biogeography, the scientific study of the distribution of species and ecosystems in geographic space and through geological time.
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