Starfishes are equipped with tube feet, and breath through structures known as papillae, tiny structures that are spread across the surface of the body. Oxygen from the water is absorbed by these structures, and by fluid in the main body cavity. Excretion of nitrogenous waste is also done through the papillae. A starfish's body fluid contains phagocytic cells known as coelomocytes, which surround waste material and forcefully eject it into the surrounding water.
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