A team of scientists believe they have uncovered the fossilized remains of the earliest life on earth.
Fossilized, single-celled organisms were discovered in Australia, and are thought to be 3.4 billion years old.
Some believe that the organisms could have also lived on Mars, as at the time when they lived there was very little oxygen on earth, and Mars was known to have had both the water and sulphur necessary to sustain the life forms.
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