The main requirement for a diverse ecosystem is that

The physical qualities of the environment, the diversity of species present, and the interactions that the species have with each other and with the environment are all factors that influence the diversity of an ecosystem.

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.

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