Viviparous and Oviparous Animals

How can you identify the animal is viviparous or oviparous? 

Why do fish and frog lay more numbers of eggs where as cow and human beings usually give birth to only one at a time?

Why do animals give birth to their babies?

Think and write how animals could hear without external ears?

Do animals that have epidermal hair give birth to young ones or lay eggs?

Is epidermal hair seen in those animals whose ear are visible outside?

Name of some animals is listed below. Observe carefully and fill the table.

Deer, Leopard, Pig, Fish, Buffalo, Giraffe, Frog, Sparrow, Lizard, Crow, Snake, Elephant, Cat.

How can we identify which animals lay eggs and which give birth to young ones?

Differentiate between viviparous and oviparous animals.