Fact 1: Running water is better able to dissolve oxygen and nutrients than standing water.

Fact 2: Large, warm rivers hold populations but few occur in cold running water.

Given the two facts above, answer the question "Rivers easily dissolve nutrients and:" with the following options: 
- bacteria
 - chemicals
 - oxygen
 - sodium
 - vitamin C
 - glucose
 - a solute
 - a hazard


 

   oxygen      