Answer:
Due to large number of species yet to be discovered in the tropics, biologists carry out a statistical comparison of temperate-tropical species richness of thoroughly studied group of insects and extrapolate this ratio to remaining groups of plants and animals. This gives them the gross estimate of total number of species on earth. This number may range in between 20 to 50 million. However, according to Robert May, for his more better scientific studies, global species diversity is about 7 million.
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