How does an embryo attach to the uterus? Find out on today's Moment of Science.
Because these growths are pieces of uterine lining, they do what uterine lining normally does every month, the tissue grows and tries to be shed.
There’s a common belief that men can sire children until they die, but that women need to be relatively young to conceive healthy children. But the father’s age affects the child’s health too.