Multiple choice

The most toxic excretory product is

  1. CO2

  2. amino acids

  3. urea

  4. ammonia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ammonia is highly toxic and requires large amounts of water for dilution and excretion. Urea is less toxic and can be concentrated. CO2 is eliminated through lungs and amino acids are building blocks, not excretory products. Aquatic organisms excrete ammonia directly, while terrestrial organisms convert it to less toxic urea or uric acid to conserve water.

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