Air is the least optimal respiratory medium because ____
a. air flow increases evaporation of water from the respiratory surface
b. air contains 30 times as much O2 as water
c. air is 1000 times less dense than water
d. air requires more energy to ventilate over the respiratory surface
e. O2 diffuses more rapidly in air than in water
ANSWER: a
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Fill in the blank(s) with the appropriate word(s).
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