Reproduction in organisms — BIOLOGY STD 12 Science — Question

Some animals give birth to young ones.
This characteristic is called vivipary.
Some animals lay eggs and this habit is called ovipary.
In viviparous animals, the fertilization is internal and the zygote develops inside the body of female animals.
These animals generally produce eggs with very little yolk which cannot support the development of the embryo and hence the zygote develops into an embryo inside the body of female.
Cartilaginous fishes like shark are an example of viviparous animals.