Answer:
The circulatory system
Explanation:
The heart, veins and arteries works together to service the cells of the body
Your body breaks down protein and then uses the nucleotides to build protein again because you need the protein for your body so you can gain energy
Hope This Helps.
First one, disease causing microorganisms
Is spread from one person to another through a variety of ways that include: contact with blood and bodily fluids; breathing in an airborne virus; or by being bitten by an insect.
