D I'm not an expert but I would say D
<span>The common cold, the flu, food poisoning, and toothaches all stem from pathogens. Pathogens are infectious agent that causes disease or illness to its host. The term is often used for agents that disrupt the normal physiology of a multicellular plant or animal, like the human.</span>
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where's the picture? I can't answer it without it
Answer: The lower respiratory system moves oxygen into the blood; the circulatory system delivers blood to the body.
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