Question

what is the connector between the uterus and the vagina? cervix idk estrogen endometrium

Explanation:

In human anatomy (a subfield of Biology, which is part of Natural Science), the cervix is the lower part of the uterus that connects the uterus to the vagina. Estrogen is a hormone, the endometrium is the inner lining of the uterus, and "IDK" is not a relevant anatomical structure. So the correct answer is Cervix.

Answer:

A. Cervix