You are presented with the question "What does blood in the veins have a lot of?" and the following answer choices: 
- Carbon dioxide
 - Carbon monoxide
 - h2o
 - Energy.
 - Air
 - kinetic energy
 - Decibels
 - Chemical energy

Now knowing that veins generally carry deoxygenated blood and deoxygenated blood is heavy with carbon dioxide, choose the best answer.


 

 Carbon dioxide        