The menstrual cycle is caused by . A. the embryo leaving the uterus.

B. the endometrium lining leaving the uterus.

C. the embryo staying in the uterus.

D. the lack of a healthy pregnancy during ovulation.

How can hind limbs be used to tell alligators and crocodiles apart? a. alligators have jagged fringe on their legs and feet, crocodiles do not. c. i don't want to get close enough to find out! b. crocodiles have jagged fringe on their legs and feet, alligators do not. d. alligators have webbed feet, crocodiles have individual toes