Biodiversity

(1) The total variability within and among species of living organisms and the ecological complexes that they inhabit. Biodiversity has three levels – ecosystem, species, and genetic diversity – reflected in the number of different species, the different combination of species, and the different combinations of genes within each species. (2) The totality of genes, species, and ecosystems in a region or the world. [Source: USDA National Plant Materials Manual]

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