What exactly are you trying to ask ??
er:
Explanation:
In the lungs CO2 is removed from the blood and send out the body where we exhale
The respiratory system regulates oxygen flow, and provides regulation for oxygen blood content. Circulatory system plays a roll in providing enough oxygenated blood to the body
Answer: Your answer would be A
Explanation:one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
