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Compositional and/or structural characteristics of molecules
Preferential abundance of structural or spatial isomers (stereoisomers or constitutional isomers) inconsistent with known abiotic processes or sources
Relative abundance of related chemical monomers
Concentration of elements and molecules in specific ratios within delineated systems.
Relative abundance of isotopes between or within molecules
Presence or relative abundance of chemical compounds that are reactive under conditions and/or timescales relevant to biological processes
Functional manifestation of one or more chemical compounds
Progress toward equilibrium in abiotically sluggish reactions
Features of crystalline substances such as crystal structure, mineral impurities, and grain size distributions.
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