How many species on Earth are yet to be discovered and described?

How many species on Earth are yet to be discovered and described?
  1. 1.5 million
  2. 20 million
  3. 50 million
  4. Unknown

Solution

The exact number of species on Earth that are yet to be discovered and described is unknown. Estimates vary widely and many of them are only educated guesses.

Asked in: NCERT

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