Coral
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The diet of corals consists of both animals and plants. They have a mouth, surrounded by tentacles. The tentacles have nematocyst, containing coiled stinging cells that paralyze prey. The food then leads to the stomach cavity, which is divided by membranes called mesenteries. Mesenteries increase the surface area of the stomach area. The mouth acts as the enter and exit, so waste is excreted through the mouth.
Box Jellyfish
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A box jellyfish generally eats small fish, sergestid prawns, shrimp, and even other species of jellyfish. The box jellyfish generally has no distinct digestive tract, so it has cilia in the digestive cavity to move water and dissolved food before absorption.
Sea Anemone
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There is a stomach-like cavity, with a single opening that functions as the mouth and anus. The mouth is typically a slit-like shape and has siphonophores, or groves. They, along with mucus, help move water and food particles. They immobilize their prey with nematocysts. The food travels down a pharynx and reaches the stomach. The food is mixed with digestion enzymes and nutrients are absorbed. Waste is excreted through the mouth.