sun bed tanning bed exposure?

Biology
Tutor: None Selected Time limit: 1 Day

The reason skin does not produce melanin outdoors at dusk and dawn is that UV in sunlight at that time of day:

 Has no UV light at all.
 Is almost all UVA
 Is almost all UVB
 Is almost all UVC
Sep 29th, 2015

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 Is almost all UVA


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Sep 29th, 2015

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Sep 29th, 2015
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Sep 29th, 2015
Feb 28th, 2017
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