Multiple choice

Urea is formed by the combination of ammonia and _________ in _________.

  1. oxygen, liver

  2. carbon dioxide, liver

  3. carbon monoxide, kidney

  4. calcium carbonate, liver

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

 Urea is formed by the combination of ammonia and carbon dioxide in liver. Ureotelic organisms are those which eliminate their nitrogenous metabolic wastes mainly as urea.