Question

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

Answer 1

Answer:

External development of young ones occurs in case of frog and fish due to which its protection from the surrounding decreases. So to cope up with the loss they lay more no. of eggs because not many have a chance to survive. Whereas in case of cow and human beings development occurs inside the mother’s body and the egg is protected. So they give birth to only one at a time.

Answer 2

Explanation:

Due to external fertilisation in frogs and fish, their progeny is more prone to die due to harsh environment... So they lay more eggs inorder to escape extinction