the nervous system
it helps it digest food
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.
In addition to the water vascular system responsible for movement and feeding, you could expect to find a digestive system in a starfish. This system includes the stomach and digestive glands for processing food.
it helps eat predators and other things and digests the food it eats
Starfish do not release energy into food. Starfish obtain energy from food.
food
Starfish filter sea water to extract nutrients and oxygen. They use their tube feet and specialized structures called podia to create water currents that bring in food particles and oxygen from the water for them to consume. This feeding behavior helps them survive and grow.
by its mouth or you eat its food