Which Statement Is True

Multiple Choice

Which statement is true?

A) Water is 80 times denser than air.
B) It does not take energy to move air over a respiratory surface.
C) Water is less viscous than air.
D) It takes more energy to move water across a respiratory surface than it does to move air across it.
E) Higher metabolic rates would more readily evolve in aquatic animals than in terrestrial animals.