You are presented with the question "What is blood heavy with?" and the following answer choices: 
- Carbon monoxide
 - Energy.
 - Bacteria
 - Chemical energy
 - matter vibrating
 - Carbon dioxide
 - Veins and arteries.
 - Water

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


 

      Carbon dioxide   