       This will raise hopes that life may be found in other
extreme environments on other planets. One of Jupiter's moons,
Europa, for example, is covered with an icy shell that may hide
a liquid ocean below where life could exist.  Dr Scott Rogers, a
biologist at Bowling Green State University, in Ohio, and led
the DNA analysis of biological material found in the ice cores,
said: "We found much more complexity than anyone thought.   "The
bounds on what is habitable and what is not are changing."
Writing in the journal PLOS One, Dr Rogers and his colleagues
said: "The sequences suggest that a complex environment might
exist in Lake Vostok.  "Sequences indicating organisms from
aquatic, marine, sediment and icy environments were present in
the accretion ice.  "In addition, another major proportion of
the sequences were from organisms that are symbionts of animals
and/or plants.  "Over 35 million years ago, Lake Vostok was open
to the atmosphere and was surrounded by a forested ecosystem. At
that time, the