mouth
the nervous system
it helps it digest food
No studies have gone into this, but you can say that starfish send their stomach and other digestive fluids out from their body to digest the food that they will eat, then the starfish will eat the partially digested food back up. So, it is sort of regurgitating.
it helps them catch food
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The Honey guide.
When starfish catch prey and get the shell cracked open they regergitate their stomach which releases enzymes to kill and liquify the prey. After it's liquified the starfish basically swallows its stomach along with its food.
it helps eat predators and other things and digests the food it eats
Starfish inhale their food right into their cardiac stomach, which comes out of their body. :D
No, it is much to cold for a starfishes body to mentane it's temproture.
Starfish do not release energy into food. Starfish obtain energy from food.
A flatworm uses its muscular adhesive organs, called the pharynx, to catch and prey on its food. The pharynx helps the flatworm attach to its prey and consume it.