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WAEC Biology 2009 Question 17

Question 17

Respiration

A group of rats placed in an air-tight box for some hours died because they

  1. A.breathed in air containing nitrogen
  2. B.produced carbon dioxide.
  3. C.ran short of energy.
  4. D.used up the available oxygen.
Show the answer and explanation

Answer: D (used up the available oxygen.)

Explanation

In a sealed box no fresh air enters, so the rats used up the oxygen needed for respiration and died.