Question

which hormone causes the endometrial layer inside the uterus to thicken?
○ estrogen
○ progesterone
○ testosterone
○ luteinizing hormone

Explanation:

Estrogen is the hormone responsible for stimulating the thickening of the endometrial lining of the uterus during the follicular phase of the menstrual cycle. Progesterone maintains the thickened lining, testosterone is a male sex hormone with minor female roles, and luteinizing hormone triggers ovulation.

Answer:

estrogen