Question

Choose the correct answers from the alternatives given .
Extensive adaptive radiations have usually followed in the wake of mass extinctions mainly because

• A. Many adaptive zones are vacated
• B. Conditions of the physical environment are usually at their most favourable after some crisis has passed
• C. The survivors have superior adaptations that enable them to spill into many environments when conditions improve after the extinction episode
• D. Given a stable environment, biological diversity tends to increase

Answer 1

The correct option is A Many adaptive zones are vacated

Mass extinction resulted in the extinction of a huge number of species. Those species which survived had a chance to flourish and spread to new habitats. Due to reduced competition, these species radiated to various different geographical habitat and eventually adapted themselves for it. Gradually these radiated species with time changed so much for adapting to new habitat that they actually became a new species.

So, the correct option is 'Many adaptive zones are vacated'.