Fact 1: Oxygen is just one substance transported by the blood.

Fact 2: Breathing and circulation allow oxygen to be transported to the body's cells.

Given the two facts above, answer the question "What process provides one substance transported by the blood?" with the following options: 
- breathing
 - heat produced
 - drink
 - complex
 - osmosis
 - sweating
 - cell division
 - condensation


 

 breathing        