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Biodiversity: patterns, drivers, and history

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Definition and levels of biodiversity

Biodiversity is the variability of life on Earth. Biologists often define it as the totality of genes, species, and ecosystems in a region, and it can be described and measured at multiple levels: genetic variability (differences in genes within and among populations), species diversity (variety and relative abundance of species), ecosystem diversity (variety of habitats and ecological communities), and phylogenetic diversity (how evolutionary lineages are represented across life).

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Genetic, species, and ecosystem diversity

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