African Lungfish, Which Are Often Found in Small Stagnant Pools

question 3

Multiple Choice

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.

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Economies of Scale

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