The letters in the diagram below represent
structures in a human female.
Estrogen and progesterone increase the chance
for successful fetal development by regulating
activities within structure
A.
A
B. B
C.
C
D.
D.

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Although i don't know what is the simulated system, starfish are predators that eat mostly  microalgae,  snails, sponges, bivalves, mussels and other small marine animals. removing starfish from any system would definitely increase this animals that they prey.