Answer:
There are two methods to estimate and
extrapolate the number of species on earth
(i) The primary method used by the
scientists to extrapolate the number of species on earth is the estimation rate
of discovery of new species.
(ii) Total number of species can
also be extrapolated by the statistical comparison of the tropical and
temperate species richness of exhaustively studied groups of insects. The ratio
is then extrapolated with existing species of plants and animals to predict the
gross estimate of the number of species on earth.
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