Fact 1: Treating water is used to remove harmful substances before drinking.

Fact 2: Distilled water is treated to remove the minerals found naturally in the water.

Given the two facts above, answer the question "Distilling water removes what before people drink it?" with the following options: 
- one celled organisms
 - single-celled organisms
 - layers of fat
 - Chemical energy
 - harmful substances
 - hydrogen
 - water
 - oxygen


 

     harmful substances    