Multiple choice

Excretion is mainly responsible for the removal of

  1. excess of water

  2. carbon dioxide

  3. unnecessary and harmful products

  4. waste products of the animal’s own metabolism

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

Excretion is mainly responsible for the removal of waste products of the animal’s own metabolism. In vertebrates this is primarily carried out by the lungs, kidneys and skin.