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.

C= $20.45, you do how many songs multiply that by each song cost and add $9.95

1.)dr. natterson- horowitz came to realize that their isn't much of a difference between animals and humans. just like humans, animals can suffer from illnesses and diseases like breast cancer, self injury, anxiety, and many more. she also discovered how they even treated and performed surgical procedures on animals just as if the animal it self were human. the los angeles zoo called dr. natterson- horowitz because they knew that she was a doctor and that  she would be able to recognize what was wrong with the gorilla. they knew that humans and gorillas were similar, so instead of calling another veterinarian, they called a doctor.