e. What makes alveoli suitable as a gas exchange surface? (choose all apply)
i. Small and many alveoli increasing the total surface area for gas exchange
ii. Large and few alveoli increasing the total surface area for gas exchange
iii. Surrounded by few blood vessels
iv. Well-supplied with blood vessels
v. Thick wall
vi. Thin wall
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iv. Well-supplied with blood vessels
vi. Thin wall
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