What specific chemical feature, if found in Earth-based analysis, would be an almost irrefutable indicator of biology?
Answer
Homochirality (life preferring one mirror-image version of a molecule)
Biological systems on Earth strongly favor one specific mirror-image version (chirality) of molecules, and discovering this pattern in Martian organics would be a powerful biosignature.
#Videos
Signs of Life on Mars? NASA's Discovery, Explained | NOVA | PBS
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