You are presented with the question "What process provides one substance transported by the blood?" and the following answer choices: 
- breathing
 - heat produced
 - drink
 - complex
 - osmosis
 - sweating
 - cell division
 - condensation

Now knowing that oxygen is just one substance transported by the blood and breathing and circulation allow oxygen to be transported to the body's cells, choose the best answer.


 

 breathing        