Question

In miocene

• A. Mammals reached a peak of diversity
• B. Reptiles reached a peak of diversity
• C. Reptiles were dominant
• D. Birds were dominant

Answer 1

The correct option is A Mammals reached a peak of diversity

The overall pattern of biological change for the miocene is one of expanding open vegetation systems (such as deserts, tundra, and grasslands) at the expense of diminishing closed vegetation (such as forests). This led to a re-diversification of temperate ecosystems and many morphological changes in animals. Mammals and birds in particular developed new forms, whether as fast-running herbivores, large predatory mammals and birds, or small quick birds and rodents. So, in miocene, mammals reached a peak of diversity. Thus, option A is correct.
In miocene period, reptiles did not reached peak of diversity or reptiles were not dominant or birds were not dominant (only new forms of birds were formed).