Why do geologists think Earth's core contains mostly iron? A. The crust also contains mostly iron.
B. The entire core is a solid mass.
C. Iron is the lightest element.
O D. Comets contain more iron than Earth's crust does.
SUBMIT

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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not sure what it is