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According to an estimate by Robert May, total species diversity is about:

$\begin{array}{1 1}(a)\;\text{7 million}\\(b)\;\text{12 million}\\(c)\;\text{22 million}\\(d)\;\text{35 million}\end{array}$

Can you answer this question?

According to an estimate by Robert may,total species diversity is about 7million
Hence (a) is the correct answer.
answered Apr 2, 2014