Ammonia is likely to be the primary nitrogenous waste in living conditions that include
A) a moist system of burrows, such as those of naked mole rats.
B) lots of seawater, such as a bird living in a marine environment.
C) lots of fresh water flowing across the gills of a fish.
D) a terrestrial environment, such as that supporting crickets.
E) lots of seawater, such as the environment of a marine mammal (e.g., a polar bear).
Answer: C