4. Country A has a rich and varied marine life, living in a beautiful but fragile marine environment. Explain two ways in which the marine life and marine environment might contribute to the economy of country A.

i don't know. the other person does though.

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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 : )