(C) $Cnidarians$ are ammonotelic and possess an incomplete digestive system,which has a single opening for both the entry of food and the exit of undi

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Mouth and body wall respectively

(C) $Cnidarians$ are ammonotelic and possess an incomplete digestive system,which has a single opening for both the entry of food and the exit of undigested waste. Nitrogenous waste materials,such as ammonia,are removed from the body surface via diffusion through the body wall.