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Ultraviolet rays and live on earth

Ultraviolet ray affects live on earth. Exposure to ultraviolet ray may cause cancer of the skin. Edited by Ashraf

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Channels: Others

Tags: On ultraviolet UV rays

Uploaded by: ( Send Message ) on 28-11-2010. Dnatube suggest users to have interest in drug testing, mesothelioma, insurance, medical lawyers.

Duration: 5m 58s

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