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The gastrovascular cavity is a structure found in primitive animal phyla. It is responsible for both the digestion of food and the transport of nutrients throughout the body. The cavity has only one opening to the environment. Food goes in and waste comes out that same opening, making it a two-way digestive tract.
The Cnidaria's digestive system is very complex but also simple. They have a one way digestive system. On way meaning that all of food ( digested or not ) go through the same way. This process is called the Gastrovascular Cavity. Every animal has their way of surviving this forever changing world. Some animals do the hunting while others get hunted. Fortunately the Cnidaria's are the hunters in this situation.