Question

if egg in women start ro form before bisth then why dis menstrual cycle occur at puberty​

Answer 1

Yes, female babies are born with all the egg cells they’re ever going to have. Nonew egg cells are made during your lifetime.

This has long been accepted as fact, however reproductive biologist John Tilly offered research in 2004 that initially purported to show new egg stem cells in mice.

This theory has been generally refuted by 

Answer 2

Explanation:

upper answer is correct mark brainlist please