African lungfish, which are often found in small stagnant pools of fresh water, produce urea as a nitrogenous waste. What is the advantage of this adaptation?
A) Urea takes less energy to synthesize than ammonia.
B) Small stagnant pools do not provide enough water to dilute the toxic ammonia.
C) The highly toxic urea makes the pool uninhabitable to potential competitors.
D) Urea forms an insoluble precipitate.
E) Urea makes lungfish tissue hypoosmotic to the pool.

Question

Quizplus · Accepted Answer

Small stagnant pools do not provide enough water to dilute the toxic ammonia, so the production of the less toxic urea is advantageous for the survival of the lungfish in these environments.

African Lungfish, Which Are Often Found in Small Stagnant Pools