Multiple choice

A fish excretes nitrogen in the form of

  1. amino acids

  2. ammonia

  3. urea

  4. uric acid

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Most fish are ammonotelic, meaning they excrete nitrogen primarily as ammonia. This is because they live in water and can easily dilute and eliminate toxic ammonia through their gills. Ammonia requires minimal energy to produce. Terrestrial organisms convert ammonia to less toxic urea or uric acid, which need less water for elimination but require more energy to synthesize.

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