Translations:AY Honors/Biodiversity/Answer Key/34/en

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Species diversity is the variety of species within a habitat or a region. Species are the basic units of biological classification and thus the normal measure of biological diversity. Species richness is the term that describes the number of different species in a given area. The world total is estimated at five to 10 million species, though only 1.75 million have been named scientifically so far.