Fact 1: Oxygen is just one substance transported by the blood.

Fact 2: Hemoglobin transports oxygen in blood.

Given the two facts above, answer the question "What transports oxygen?" with the following options: 
- Hemoglobin
 - hydrocarbons
 - orchids
 - roots
 - alpacas
 - burning coal
 - lungs
 - mammals


 

 Hemoglobin        