If you remove starfish from an ocean shoreline ecosystem, what happens to the mussel (clam) populations?
they become extinct.
the area becomes more diverse with more kinds of clams.
one species of clam crowds out all the others.
the clams begin to prey on each other.

Which describes a difference between cephalopods and gastropods? cephalopods have a water vascular system, and gastropods have an open circulatory system. cephalopods live only in ocean environments, and gastropods live in a variety of environments. cephalopods have a simple nervous system, and gastropods have a complex nervous system. cephalopods are the largest group of mollusks, and gastropods are the smallest group of mollusks.