Answer:
Antigen
Explanation:
Bacteria and virus have antigens, our body produces the antibodies.
The answer to this D.hope this helps.
Just as the organs in an organ system work together to accomplish their task, so the different organ systems also cooperate to keep the body running. For example, the respiratory system and the circulatory system work closely together to deliver oxygen to cells and to get rid of the carbon dioxide the cells produce.
Photosynthesis. “Photosynthesis is the process in which light energy is converted to chemical energy.”
Cancer? it does depend on what cancer they have