Which type of fertilization and development occurs in the life cycle of the organisms represented below?

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

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 : )