Question

why do fish and frog lay more eggs whereas cows and human beings usually give birth to only at a time​

Answer 1

Answer:

Explanation:

Fishes n frogs lay thousands of egg at a time as their fertilization is external and many of their eggs get destroyed n damaged due to external fertilization and only some of them forms zygote ,this helps them to maintain their race whereas in mammals or human beings fertilization is internal and only one zygote is formed. In humans zygote is very safe inside mother's womb.

Answer 2

Answer:

because mammals cannot give birth to 2 Or more than 2 babies at a time.........

but fishes and froges give eges more than two because they there not big like mammals.....

and human being and cows r mammals....... which give direct birth to baby......