Which one of the following is not responsible for the extinction of a species?

Detailed Solution:

The correct answer is “Broad niche”.

A broad niche means that a species can adapt to a wide range of environmental conditions and utilize various resources, which can actually help in its survival.

In contrast, a narrow niche may make a species more vulnerable to extinction due to its dependence on specific conditions or resources.

Large body size and lack of genetic variability can also increase the risk of extinction.