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The best estimate of the number of species on earth is:
A1 billion
B10 million
C2 million
D100 million
Answer & Solution
Correct answer: B. 10 million
1. Estimates range from 2 million to 100 million.
2. 10 million is the best estimate.
3. New species are discovered regularly.
_Source: NCERT Class 11 Fundamentals of Physical Geography, Chapter 16, Biodiversity and Conservation._
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