Running water is better able to dissolve oxygen and nutrients than standing water.
If the water stands still and becomes stagnant, it can become a breeding ground for mosquitoes.
Running water is better able to dissolve oxygen and nutrients than stagnant water.
Running water is better able to dissolve oxygen and nutrients than what?

* pouring water
* scarce resources
* ocean water
* river water
* acetic acid
* Veins and arteries.
* an organism's body
* stagnant water