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Hydra, categorized as a coelenterate, possesses a body structure where the single opening functions for both feeding and expelling waste, supplemented by diffusion through its body wall.

1. Hydra exhibits a body design with a single opening.
2. Hydra has a fully developed digestive tract.
3. Hydra is equipped with a circulatory system.
4. Hydra utilizes a specialized respiratory system.

Correct answer: Hydra exhibits a body design with a single opening.

Solution

Hydra, being a coelenterate, exhibits a blind sac body plan where a single opening functions for both ingestion and egestion. It lacks a complete digestive, circulatory, or respiratory system.

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