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Comets and asteroids have been blamed for bringing life to Earth in the form of bacteria and wiping out the dinosaurs. Now scientists say they may also be responsible for sex.

The origin of sex remains one of biology?s greatest mysteries. Scientists can?t say exactly why we do it. Before sex, life seemed to manage fine with asexual reproduction. Researchers Claus Wilke and Chris Adami of Caltech and NASA?s Jet Propulsion Laboratory have used digital organisms to simulate life before sex and reveal a possible mechanism for the start of sex.
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