SORU: aşağıdaki parçaya göre cevaplayınız
One understands from the passage that astrobiologists ----.
An organism discovered deep in the ground has taken
astrobiologists by surprise. The organism's unique ability
to live in complete isolation from other species, or even
light or oxygen, suggests it could be the key to life on
other planets. It was discovered in fluid-filled cracks in a
South African gold mine, nearly three kilometres beneath
the Earth's surface. When US scientists analyzed the fluid,
they expected to find genes from a mix of species. Instead,
they found that 99.9 per cent of the DNA belonged to just
one bacterium, a previously unknown species. Such a
self-sufficient organism is virtually unheard of. It means
that this organism extracts everything it needs from an
otherwise dead environment. Almost all other known
organisms on the Earth that do not use sunlight directly do
use some product of photosynthesis. However, this
newly-found organism gets its energy from the radioactive
decay of uranium in the surrounding rocks. It also has
genes to extract carbon and nitrogen from its
environment, both of which are essential for making
proteins. Scientists believe that this organism is just the
type that could survive on a planet other than the Earth.