Read the following statements and choose the following option: 1. Land reptiles went back into water to evolve into fish like reptiles probably 100 mya (e.g. Ichthyosaurs). 2. The water reptiles were, of course, the dinosaurs. 3. The smallest of dinosaurs, i.e., Tyrannosaurus rex was about 20 feet in height and had huge fearsome dagger like teeth 4. About 50 mya, the dinosaurs suddenly disappeared from the earth.

Step-by-step solution

The first mammals were like shrews. Their fossils are small sized. Mammals were viviparous and protected their unborn young inside the mother’s body. Mammals were more intelligent in sensing and avoiding danger at least. When reptiles came down mammals took over this earth. There were in South America mammals resembling horse, hippopotamus, bear, rabbit, etc. Due to continental drift, when South America joined North America, these animals were overridden by North American fauna. Due to the same continental drift po