Answer:
Estrogen and Progestrone harmone help in the thickening of the inner wall of the uterus i.e. endometrium layer,for the reception of fertilized eggs and their development.
Progestrone prepares the uterus for a fertilizef egg to implant.
The uterus lining sheds if no fertilization occured because the sperm passes through the uterus so.the lining of the uterus again starts to break down and shed ,and new mestural period begins
Explanation:
Hope this helps u!!
Answer is a cause atoms have a positive charge and are located in nucleus
