What do you mean by hollow gut
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A hollow gut is referred to as Phylum Coelenterata, belongs to the kingdom Animalia.
• Coelenterates have a hollow, bag-like structure called a gastrovascular cavity.
• There is a single opening at one end for water and food passage.
• These are the living species belong to the phylum Cnidaria.
• Coelenterate is the older name for the phylum Cnidaria.
• These are having simple body tissues, like nerves. They have two main layers of cells, the middle layer is jelly-like material.
• Examples for Coelenterates
Jellyfish, sea anemones, etc.