Difference Between Fish And Starfish

Starfish is any of various asteroids or other echinoderms (not in fact fish) with usually five arms, many of which eat bivalves or corals by everting their stomach while fish is (countable) a cold-blooded vertebrate animal that lives in water, moving with the help of fins and breathing with gills or fish can be (obsolete) a counter, used in various games.

The diaphragm is what i think ur talking about