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During the period when living things appeared on Earth, the surface level of ultraviolet (UV) radiation is believed to have been much higher than current levels, because oxygen levels were too low to form an ozone layer. This UV radiation would have damaged living cells that were not protected, suggesting that the earliest life was in warm water around deep-sea volcanic vents.

However, some scientists have theorized that a hydrocarbon haze in the atmosphere could have compensated for the lack of upper level absoption, while providing the surface heat necessary for living organisms.

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Aisha Wiza

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3y ago

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