If the Earth is neither tilted toward or away from the Sun, then the northern 1 point hemisphere will experience ---
A-spring or fall
B-summer or spring
C-summer or fall
D-fall or winter

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.

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?