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What happens in the netlike structure labeled B in the diagram?

(A) Carbon dioxide and oxygen diffuse into the blood
(B) Nitrogen and oxygen are exchanged,
(C) Carbon dioxide and oxygen are exchanged,
(D) Nitrogen and carbon dioxide remain constant,

What happens in the netlike structure labeled B in the diagram? (A) Carbon dioxide-example-1
User Skyfishjy
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A carbon dioxide and oxygen diffuse into the blood
User Michaellindahl
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