Ammonia is Likely to Be the Primary Nitrogenous Waste in Living

Question

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

Accepted Answer

Ammonia is highly toxic and requires a large amount of water for its excretion. Aquatic animals, such as fish, can easily excrete ammonia through their gills due to the constant flow of fresh water.