I'd say: By far.

http://en.wikipedia.org/wiki/Tardigrade

  "Tardigrades are polyextremophiles and are able to survive in extreme
environments that would kill almost any other animal. Some can survive
temperatures of -273?C (-460?F), close to absolute zero, temperatures
as high as 151?C (303?F), 1000 times more radiation than other animals,
and almost a decade without water. In September 2007, tardigrades were
taken into low Earth orbit on the FOTON-M3 mission and for 10 days were
exposed to the vacuum of space. After they were returned to Earth, it was
discovered that many of them survived and laid eggs that hatched normally,
making these the only animals known to be able to survive the vacuum of
space."

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                                                          - Warp

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