Treating water is used to remove harmful substances before drinking, and ordinary tap water can be full of harmful substances like chlorine, pesticides and heavy metals. Given these facts, what does treating water remove before drinking it among the following options:
- direct damage to the lungs
 - h2o
 - an area swollen with pus
 - chlorine, pesticides, heavy metals
 - molecules
 - vapor
 - Mutagenic chemicals
 - nonliving organic matter


 

    chlorine, pesticides, heavy metals     