The most primitive vertebrates whose reproductive pattern includes the amniotic eggs are the the most primitive vertebrates whose reproductive pattern includes the amniotic eggs are the bony fish reptiles amphibians mammals birds

answer; i believe the correct answer is (sporophyte);

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 : )