The moist surface is an adaptation for efficient gas exchange in the air sacs (Option C).
- The air sacs (alveoli) are structures in the lungs that take up oxygen when breathing.
- These structures (alveoli) are found at the end of bronchial tubes.
- The air sacs have thin walls and a lot of capillaries in order to facilitate gas exchange.
In conclusion, the moist surface is an adaptation for efficient gas exchange in the air sacs (Option C).
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