Fact 1: Veins generally carry deoxygenated blood.

Fact 2: Deoxygenated blood is heavy with carbon dioxide.

Given the two facts above, answer the question "What does blood in the veins have a lot of?" with the following options: 
- Carbon dioxide
 - Carbon monoxide
 - h2o
 - Energy.
 - Air
 - kinetic energy
 - Decibels
 - Chemical energy


 

 Carbon dioxide        