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Question

Which of the following is essential for the life of all animals?
  1. Nitrogen
  2. Oxygen
  3. Carbon dioxide
  4. Carbon monoxide


Solution

The correct option is B Oxygen
The oxygen is essential for the life of all animals.The oxygen is taken in by the animals which burn the food consumed by the animals and liberates energy and carbon dioxide.This carbon dioxide is expelled out of the animal's body.

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