NEETZoologyEvolution
How were the first mammals different from reptiles?
Options
- AThey were smaller in size
- BThey were viviparous and protected their unborn young inside the mother’s body
- CThey were cold-blooded
- DThey laid eggs instead of giving live birth
Correct answer
B. They were viviparous and protected their unborn young inside the mother’s body
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