Question

In oviparous animals like reptiles and birds, the fertilised eggs covered by hard calcareous shell are laid in a safe place in the environment; after a period of incubation young ones hatch out. On the other hand, in viviparous animals (majority of mammals including human beings), the zygote develops into a young one inside the body of the female organism.

Accepted Answer

SEXUAL REPRODUCTION 1.2.3 Post-fertilisation Events1.2.3.2 Embryogenesis

Text	In oviparous animals like reptiles and birds, the fertilised eggs covered by hard calcareous shell are laid in a safe place in the environment; after a period of incubation young ones hatch out. On the other hand, in viviparous animals (majority of mammals including human beings), the zygote develops into a young one inside the body of the female organism.
Extra	SEXUAL REPRODUCTION 1.2.3 Post-fertilisation Events 1.2.3.2 Embryogenesis

Animals Young Oviparous Reptiles Birds Fertilised Eggs Covered