Fact 1: Veins generally carry deoxygenated blood.

Fact 2: Arteries and veins are blood vessels.

Given the two facts above, answer the question "what generally carries deoxygenated blood?" with the following options: 
- blood vessels
 - animals
 - layers of fat
 - mammals
 - critical organs
 - an organism's body
 - elephants
 - athletes


 

 blood vessels        