How can geologists tell what order Rrick layers formed I. ? A new Rick layers from on top of existing Rock layers b new rock layers from on bottom of existing rock layers c top rock layers are older or d top rock form first

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.