Question

A disadvantage of gas exchange in aquatic habitats, as compared with terrestrial habitats, is that
A. Gas exchange surface tends to collapse in water
B. Water current are too slow for most types of surfaces
C. Oxygen concentration in water is much lower than in air
D. Carbon dioxide concentration in water is much lower than in air
E. Oxygen concentration in water is higher than in the air

Answer 1

Carbon dioxide concentrations in water and in air areapproximately similar. Low ability of oxygen to dissolve in water, especially
when it gets warmer, is the main difficulty to aquatic habitats, and they should filter a lot of water through their gills to get enough oxygen. Thus, the correct answer is C