Which statement is true about water molecules?

the oxygen atom has a negative charge.
the hydrogen atoms do not share electrons.
water molecules move randomly around each other.
water molecules cannot dissolve many substances

Water molecules move randomly around each other.

Water is in the liquid state, where the molecules possess the ability to move around. 

Ha ha it happens bro

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.