Question

Choose the correct answers from the alternatives given .
The greatest adaptive radiation of the animal kingdom occurred during the

• A. early Precambrian era
• B. late Precambrian era
• C. early Palaeozoic era
• D. early Mesozoic era

Answer 1

The correct option is C early Palaeozoic era

During the Cambrian period, the most rapid evolution of new animal species and adaptive radiation occurred.

The Cambrian period, occurring between approximately 542–488 million years ago, marks the most rapid evolution of new animal phyla and animal diversity in earth’s history. It is believed that most of the animal phyla in existence today had their origins during this time, often referred to as the Cambrian explosion.

A cambrian period was during the early Palaeozoic era.

So, the correct option is 'early Palaeozoic era'.