'The main purpose of a red blood cell is to carry this gas from your lungs to the rest of your body'
oxygen
GASES: The main purpose of a red blood cell is to carry this gas from your lungs to the rest of your body
The main purpose of a red blood cell is to carry this gas from your lungs to the rest of your body
The main purpose of a red blood cell is to carry this gas from your lungs to the rest of your body
GASES
oxygen
GASES