The bones of forelimbs of whale, bat, cheetah and man are similar in structure, because
1. one organism has given rise to another
2. they share a common ancestor
3. they perform the same function
4. they have biochemical similarities
Viviparity is considered to be more evolved because
| 1. | the young ones are left on their own |
| 2. | the young ones are protected by a thick shell |
| 3. | the young ones are protected inside the mother's body and are looked after they are born leading to more chances of survival |
| 4. | the embryo takes a long time to develop |