The immune system protects the body from foreign substances and cells. Our immune system protects us from <span>tiny organisms such as bacteria, parasites, and fungi which cause infections.</span>
Correct answer: <span>A. The immune system
</span>Good luck with your studies, I hope this helps~!
3) because during the menstrual cycle the body is already trying to clean out the uterine lining and the old egg is already in that. So having a new egg drop in form the ovary at the end of the cycle makes more sense.
