The digestive sac of a jellyfish has openings?

The digestive sac of a jellyfish, known as the gastrovascular cavity, has a single opening that serves as both the mouth and the anus. This cavity is responsible for digestion and nutrient absorption, allowing the jellyfish to break down food and expel waste through the same opening. The simple design is effective for their feeding strategy, which primarily involves capturing small prey using their tentacles.