Ncert Exercises & Solutions

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

(c) Viviparity is considered to be more evolved because the young ones are protected inside the mother's body and are looked after once they are born, leading to more chances of survival,.e.g., mammals.

However, in oviparity, the female lays fertilised/unfertilised eggs covered by a hard calcareous shell in a safe place in the environment. The chances of survival are less as the young ones are left on their own.

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