I’m pretty sure the answer is A but if you already ruled that out try B
Answer:
B
Explanation:
It removes other waste from our body and keeps our blood clean
William Smith and Georges Cuvier
Answer:haemoglobin
Explanation:
Inside the air sacs, oxygen moves across paper-thin walls to tiny blood vessels called capillaries and into your blood. A protein called haemoglobin in the red blood cells then carries the oxygen around your body.
