What is it called when elements differ in their ability to pull electrons toward them - or give them up to other elements that pull on them more

Electronegativity Electronegativity

Explanation:

Electronegativity is a property that describes the tendency of an atom to attract electrons  toward itself.

The answer is Electronegativity. Let me know if this helps! :))

Explanation:

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.

i hope this : )