If you are in Birmingham, AL, and you want use your cell phone to talk to your cousin in Houston,
TX, what must occur in order for communication to be completed?

i think the answer is

mass

what's the

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.

nucleus

would be most reasonable answer tbh