Valuation and Contingency in Biology: A Structural Account of Reproduction, Sacrifice, and Diversity

Biological systems persist, reproduce, and diversify while paying sustained energetic costs that favor equilibration. This paper argues that any coherent explanation of persistence under cost must presuppose two structural primitives: valuation, an internal discriminator that ranks non-equilibrium states above equilibrium and is empirically manifest as paid work against entropy; and contingency, a genuine possibility space in which alternatives to persistence are available. We identify sacrifice as the operational signature of valuation across biological scales and show how diversity functions as a biosphere-level stabilization strategy. The result clarifies, rather than replaces, evolutionary explanation.