Exchange of gases occurs by which process?

A. Active transport A.

B. Diffusion B.

C. Osmosis C.

D. Endocytosis D.

Correct Answer: B সঠিক উত্তর: B

Explanation ব্যাখ্যা

Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. In the context of gas exchange, this means oxygen moves from the air in the lungs (where it's more concentrated) into the bloodstream (where it's less concentrated) and carbon dioxide moves in the opposite direction. This process is passive, meaning it doesn't require energy.

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Correct Answer: B সঠিক উত্তর: B

Explanation ব্যাখ্যা

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