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Similarities Despite major overall differences, there are some basic similarities in the two processes: Light energy excites an electron to a higher energy level. A covalent bond is broken as the electron moves elsewhere. This process is called ‘photolysis’ and is purely chemical. Differences The difference is in what happens to the excited electron ...


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We don't get it from the sun, it's synthesized. Humans can get it... via nutrition. via synthesis in the skin, which depends on UV radiation. Sun is the major source of it (the radiation, not the vitamin), and synthesis in the skin the major source of the vitamin. However, it needs further modification in the liver or kidney to become bioactive. UV ...



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