Which of the following is NOT a characteristic of an efficient respiratory surface?
- A. It is dry and thick
- B. It is thin
- C. It is kept moist
- D. It has a large surface area
Explanation
Gases must dissolve before diffusing, and distance must be tiny, so efficiency demands a moist, thin, extensive surface. A dry thick barrier would stop diffusion, which is exactly why land animals keep their lungs internal.
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