The part of the health curriculum that outlines what will be taught is the:

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.

What is it that you need with?

Answerreceives filtrate from blood instead of coelomic fluid;