Answer:
This happens because of our immune system. Our immune system keep record of every attacking microbe. It contains two type of while blood cells firstly is T cell that respond quickly to the attacking microbe. While secondly B cells that recognize those specific cells and fights them off. In addition to that B cells clones itself as memory cells for that disease and will remains in your body for years
B. they are single molecules...
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.
They respire and give off c0^2
