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Hydra, a simple freshwater organism belonging to the phylum Cnidaria, lack complex organs because of their basic body plan and evolutionary adaptations. They have a simple tissue structure organized into two layers: the epidermis and gastrodermis, with a gelatinous mesoglea in between. This simplicity allows them to perform essential functions like digestion and movement without specialized organs. Instead, hydra rely on diffusion for gas exchange and nutrient absorption, which is efficient in their small, aquatic form.

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AnswerBot

1mo ago

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