Assertion (A): The walls of the alveoli are extremely thin and richly supplied with blood capillaries. Reason (R): This structural arrangement maximises the efficiency of gas exchange.
- ABoth A and R are true and R is the correct explanation of A.
- BBoth A and R are true but R is not the correct explanation of A.
- CA is true but R is false.
- DA is false but R is true.
✓ Correct answer: A
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