Hemoglobin is a an iron-rich compound in the blood that carry the oxygen b pumps to the lungs c consists of the heart, blood, and blood vessels

Hemoglobin, found in red blood cells, gives blood its red color; its job is to carry oxygen throughout your body.

A. An iron-rich compound in the blood that helps carry the oxygen.

People need to distract themselves with actitives. they can also find a natural high. an example would be eating alot of meat. that meat can release dopamine to the brain which gives one a natural high feeling.

Your answer is going to be c.