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The exchange of gases in the alveoli of the lungs takes place by

1. (a) simple diffusion
2. (b) osmosis
3. (c) active transport
4. (d) passive transport

Correct answer: (a) simple diffusion

Solution

The exchange of gases in the alveoli of the lungs takes place by simple diffusion, where oxygen diffuses into the blood and CO₂ diffuses out.

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