The ocean contains ecosystems that can support life without plants. where are these ecosystems most likely located? a. in the open ocean b. near the shoreline c. in an estuary d. in the deep ocean

trachea, alveoli, lung capillaries, arteries

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 : )