The more formal experiments on the relationship between germ and disease were conducted by Louis Pasteur between 1860 and 1864. He discovered the pathology of the puerperal fever and the pyogenic vibrio in the blood, and suggested using boric acid to kill these microorganisms before and after confinement.
Answer: Its B because Arteries deliver oxygenated blood to the capillaries, where the exchange of oxygen and carbon dioxide takes place.
Plants take in nitrogen from the soil by absorption. So option B.
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