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WAEC Biology 2015 Question 9

Question 9

Excretion

Water and salts are both lost from the human body in

  1. A.breath and sweat.
  2. B.breath and urine.
  3. C.breath, urine and sweat.
  4. D.sweat and urine.
Show the answer and explanation

Answer: D (sweat and urine.)

Explanation

Exhaled air carries water vapour and carbon dioxide but no salts. Sweat and urine both contain water with dissolved salts.