Final answer:
Warm water holds less dissolved oxygen than cold water because of decreased molecular motion.
Step-by-step explanation:
The solubility of oxygen in water is affected by temperature and pressure.
Warm water holds less dissolved oxygen than cold water because of decreased molecular motion.
As water temperature increases, the molecules move faster, making it harder for oxygen molecules to dissolve in the water.
Cold water, on the other hand, holds more dissolved oxygen because the slower molecular motion allows for easier dissolution of oxygen.