Multiple Choice
The principal reason(s) for why gills were replaced with different types of respiratory organs in terrestrial animals is (are)
I-tissues and organs are less buoyant in air than in water.
II-countercurrent exchange is not very efficient at maximizing blood oxygenation levels.
III-water diffuses into air through evaporation.
A) I and III
B) just II
C) just I
D) II and III
E) I, II, and III
Correct Answer:
Verified
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