It is a chemical reaction. Where two elements/compounds are fused together to form a new compound.
the first answer as blood needs to be oxygenated to be passes round the body then when its deoxgenated it will return to the heart to be pumped around the body again
Its true as you breath your heart and lungs go in and out as if you were swinging a door open and shut letting oxgen in and out hope i could help :)
Is it a question or an answer
Answer: A. White Blood Cells
Explanation:
