What is the primary reason current rover instruments cannot definitively prove the biological origin of organic markers?

Answer

They cannot perform the complex, multi-stage laboratory analyses necessary to absolutely rule out non-biological origins.

Proving life requires highly sophisticated analysis, such as measuring isotopic ratios, which demands powerful microscopes and mass spectrometers housed in dedicated Earth laboratories, not the rover's onboard toolkit.

What is the primary reason current rover instruments cannot definitively prove the biological origin of organic markers?
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