Gas exchange is more difficult for aquatic animals with gills than for terrestrial animals with lungs because ________.
A) water is less dense than air
B) water contains much less oxygen per unit volume than air
C) gills have less surface area than lungs
D) gills allow only unidirectional transport
E) gills collapse in air

Question

Quizplus · Accepted Answer

Water contains much less oxygen per unit volume than air, making it more difficult for aquatic animals with gills to obtain enough oxygen for respiration.

Gas Exchange Is More Difficult for Aquatic Animals with Gills