Question

A species is considered to be extinct if it has been seen in its natural

  1. 15 years
  2. 25 years
  3. 40 years
  4. 50 years

Answer:

Option D: 50 years

Detailed Solution:

The correct answer is “50 years”.

A species is generally considered to be extinct if it has not been seen in its natural habitat for at least 50 years. This is a common criterion used by conservation organizations, including the International Union for Conservation of Nature (IUCN).