please help meeeeeee!

Answer:
Refer to the explanation for the answer!
Explanation:
Hello! This is what I've found for the answer:
Inside of the diagram, this is what each label stands for, or what it means.
A. CO2, (Cardon Dioxide is let out)
B. O2, (Oxygen is let in)
C. Blood circulates that's low in CO2 but high in O2
D. Oxygen Diffusion Process
E. Blood gets transported around the body
F. Resembles the flow of Red Blood Cells
G. CO2 Diffusion Process
H. Blood circulated that's low in O2 but high in CO2.