Question

The animals that give birth to young ones are
A. Reptiles
B. Birds
C. Amphibians
D. Mammals.

Answer 1

Viviparous are animals that give birth to live younger ones that have developed inside the body of the parent.

Complete answer: Animals giving birth to younger ones are called viviparous animals. The eggs of these animals normally consist of less of yolk inadequate to support the growth of the zygote into an embryo. Hence, growth proceeds in the body of the female animal and the fully developed embryo is delivered.

Now lets us find the solution from given options -
1. Reptiles are oviparous animals. Their egg normally has more quantity of yolk and might support the growth of the zygote into an embryo. Ovovivipary is an in-between state of stage in which eggs are retained till embryo is evolved and is then delivered.
2. Animals like birds, lizards and butterflies which lay eggs are known as oviparous animals. They lay an egg in order that they do not give birth to a younger one.
3. Amphibious are the animals that may stay on water as well as on land. They reproduce by laying eggs that do not have a gentle skin and tough shell.
4. Animals which include human beings, cows and dogs which provide birth to younger ones are known as viviparous animals. Viviparous are animals that give birth to younger one which have evolved in the body of the parent.

Thus, the right answer is option D. i.e. Mammals.

Note: Most mammals give birth to live young, however a few (the monotremes) lay eggs. Live birth also takes place in a few non-mammalian species, which includes guppies and hammerhead sharks; for that reason it is now no longer a distinguishing function of mammals.