What is the most conservative and scientifically sound estimate of the global species diversity?

What is the most conservative and scientifically sound estimate of the global species diversity?
  1. 20 million
  2. 50 million
  3. 7 million
  4. Unknown

Solution

A more conservative and scientifically sound estimate made by Robert May places the global species diversity at about 7 million.

Asked in: NCERT

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