The higher animals have special organs for exchange of gases as their skin is ___________ ?
Correct answer: B. Thick
- A. Thin
- B. Thick
- C. Soft
- D. Hard
Explanation
In higher animals, the skin is relatively thick and is not sufficient for rapid diffusion over the whole body, so specialised respiratory organs are needed. Students may choose thin because gases diffuse through thin surfaces, but that describes an efficient respiratory surface rather than the general skin of higher animals.
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