The rapid advance and increasing complexity of medical science
I think it might be values.
Answer:
you could use styrofoam for the planets and the sun and paint them, for rings around planets you could use pipe cleaners and use a styrofoam bottom and have sticks to secure the planets
Explanation:
CO2 from the blood is released from the blood cells into the alveoli for exhalation while O2 from the alveoli is received into the blood cells to deliver oxygen to other parts of the body
D is the answer for your question
