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 synthesise 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 makes lungfish tissue hypoosmotic to the pool.

Question

Quizplus · Accepted Answer

Small, stagnant pools do not provide enough water to dilute the toxic ammonia produced by other animals. By producing urea, which requires less water to excrete than ammonia, African lungfish can survive and thrive in these types of environments where other animals cannot.

African Lungfish, Which Are Often Found in Small, Stagnant Pools