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What share of all species that ever lived on earth are extinct today?
A99 per cent
B50 per cent
C10 per cent
D75 per cent
Answer & Solution
Correct answer: A. 99 per cent
1. A species lasts one to four million years on average.
2. 99 per cent of species ever are extinct.
3. Biodiversity is in constant evolution.
_Source: NCERT Class 11 Fundamentals of Physical Geography, Chapter 16, Biodiversity and Conservation._
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