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The gastrovascular cavity acts as a hydrostatic skeleton against which the contractile cells work.

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Humans and hydras have distinct digestive processes due to their anatomical differences. Humans possess a complex digestive system with specialized organs, such as the stomach and intestines, where food is broken down and nutrients are absorbed. In contrast, hydras have a simpler, two-way digestive system with a single opening that serves both ingestion and excretion, relying on extracellular digestion in their gastrovascular cavity. This allows hydras to digest food more directly and absorb nutrients directly into their cells.


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