1. Clean, dry air at sea level is made up of ___________.
  1. 77 percent nitrogen and 21 percent oxygen
  2. 78 percent nitrogen and 20 percent oxygen
  3. 78 percent nitrogen and 21 percent oxygen
  4. 80 percent nitrogen and 20 percent oxygen
Wrong!  The correct answer is C. 78 percent nitrogen and 21 percent oxygen.
Statement No. 96:  Clean, dry air at sea level is made up of 78 percent nitrogen and 21 percent oxygen.