6. An electron microscope would be best used for magnifying and viewing a. specific cell structures
b. living bacteria
c. torn cartilage
d. heart function

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 : )

sex cells are usually half's then they find another half and make a fertilize egg

the answer is d p: cell, q: organ, r: organ system, s: tissue