During evolutionary refinements that led from fish to mammals, why was a shift from gills to lungs necessary?
A) Gills aren't as efficient as lungs in picking up oxygen.
B) Gills are too small to service a mammal's need for oxygen.
C) Gills work only in water; lungs work only on land.
D) Protecting gas-exchange surfaces from drying out is difficult in gills when on land.
Correct Answer:
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