Which features are required for efficient external respiration to take place?

A. The gases being exchanged must be present in a low concentration in order for diffusion to occur.
B. The gas exchange region must be moist, thin and have a large surface area.
C. Gas exchange can only occur at a temperature lower than the body temperature of the organism.
D. The gas exchange needs to occur in an aquatic environment in order to be efficient.
E. The gas exchange region must be dry, thin and have a large surface area.


Answer: B

Biology & Microbiology

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