"Humans are an unusual species. Among mammals, only humans and great apes - gorillas, chimpanzees and orangutans - have menstrual cycles! Other mammals have oetrus cycles. In the oetrus cycle, the uterine lining is absorbed back into the body when it breaks down, instead of flowing out of the body as the menses."

oh really? i didnt know that!
HAHA.

i hope stages in menstrual cycle will come out for essay question tmrw!
i can explain that really well (: