Multiple choice

The nitrogenous waste in Amphibia is:

  1. ammonia

  2. trimethyl oxide

  3. urea

  4. calciferol
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Amphibians primarily excrete nitrogenous waste as urea, which is less toxic than ammonia and requires less water to eliminate than ammonia. This adaptation allows them to live in terrestrial environments where water conservation is important. Tadpoles excrete mostly ammonia, but adult amphibians switch to urea production as they transition to land.

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