5. In a basic solution a. concentration of OH- b. concentration of OH-> concentration of H+
c. concentration of H+ > concentration of OH-
d. concentration of OH-= concentration of H+

i do not know and i have a 100 in this class

answer; i believe its (ovulation);

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 : )