sentence1: A sidebar notes that controversy remains over the Mars meteorite that crashed into Antarctica about 11,000 years  While scientists have demolished most of the evidence that the meteorite contained living creatures, they cannot explain why the meteorite contains a molecule that on Earth is only produced by biological processes and true is true and true is true and true is true and true is true and true is true .
sentence2: There is another, undiscovered process responsible for the molecule's existence.