Is light necessary for the living/creation of human?

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Is light necessary for the living/creation of human?

Postby CHONMAN on December 16th, 2010, 11:27 pm 

I know that Carbon, Hydrogen, Oxygen and Nitrogen are the main compounds for a living organism. What i was wondering is Light needed for the creation or existence of a human being?

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Re: Is light necessary for the living/creation of human?

Postby Paralith on December 17th, 2010, 12:37 am 

The only time humans need sunlight directly is to synthesize vitamin D. But, we can always take vitamin supplements instead. Light and dark cycles also help our circadian rhythms, but we can survive without them. Other than that, humans only need sunlight in the indirect way that most animals on this planet need sunlight - sunlight is used by plants to fix carbon from the atmosphere, animals get their carbon from eating plants or other animals who have eaten plants.
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Re: Is light necessary for the living/creation of human?

Postby Nick on December 17th, 2010, 5:13 am 

On another level chemistry is all just light interacting with electrons, so if there's any chemistry going on there is light and all living things need light (just not necessarily an external light source like the sun).
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Re: Is light necessary for the living/creation of human?

Postby Lincoln on December 17th, 2010, 10:24 am 

You're being such a physicist....
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