Which of the following does not have specialized respiratory organs?
Correct answer: A. Hydra
- A. Hydra
- B. Cockroach
- C. Birds
- D. Both A and B
Explanation
Hydra has neither blood and blood vessels, nor organs of excretion and respiration, which are carried on individually by each cell. Due to the thinness of the body wall and circulation of water in the gastrovascular cavity, most of the cells of the body remain freely exposed to the surrounding water.
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