Fact 1: Arteries generally carry oxygen-rich blood.

Fact 2: Arteries turn into smaller arteries called arterioles.

Given the two facts above, answer the question "what carries oxygen-rich blood?" with the following options: 
- humans
 - elephants
 - arterioles
 - ducks
 - mammals
 - animals
 - four limbs
 - bears


 

   arterioles      