Question

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

Answer 1

Answer:

So, their large numbers enables adequate number of eggs to get fertilised even if some eggs are destroyed. In case of humans and others, the process of fertilisation occurs inside the body.

Explanation:

Answer 2

Answer:

they lay more eggs because if some the eggs were destroyed rest will produce Young ones after fertilisation