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-Biological diversity or biodiversity encompasses the variety and abundance of plants, animals and microorganisms as well as the ecosystems and ecological processes to which they belong. Biodiversity is usually considered at three levels, genetic diversity, species diversity and ecosystem diversity. Genetic diversity is the total genetic information contained in the genes of individual organisms.
-Species diversity refers to the variety of living organisms. Ecosystem diversity relates to the enormous diversity of habitats and biotic communities, as wells as to variety of ecological processes within ecosystems (McNeely and others, 1990). Remarkably little is known about species diversity in quantitative terms.
-Estimates about of total number of species on earth range from 2 million to 100 million of which less than 1.5 million have been named and only a small fraction of these have been considered for their economic value (Reid, 1992). Reid and Miller (1989) have estimated that 5 to 10 percent of these species are presently being lost each decade.
marto answered the question on March 20, 2019 at 11:01
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