Abstract The observable diversity of molecules on Earth arises from an immense chemical possibility space constrained by fundamental natural laws. While theoretical combinations of atoms yield an astronomically large number of possible molecular structures—estimated at 10¹³⁰ for proteins of length 100 alone—only a highly selective subset persists in reality. This paper presents a unified framework explaining molecular diversity through the principle of selection by natural balance, integrating chemical bonding thermodynamics, environmental feedback mechanisms, and the Universal Balance–Feedback Framework (UBFF). We formalize the molecular realization gap using a constraint satisfaction formalism, define the UBFF stability operator over chemical state space, and derive conditions under which molecular persistence corresponds to Lyapunov-stable equilibria in a balance–feedback dynamical system. The framework yields three empirically testable predictions regarding perturbation resistance, environmental co-evolution, and the upper bound on biologically functional molecular diversity. We show that UBFF provides interpretive leverage beyond standard thermodynamic accounts by unifying selection, stability, and feedback within a single formal structure, and demonstrate correspondence with Friston’s free-energy principle at the chemical systems level.
Angelito Enriquez Malicse (Thu,) studied this question.