The graviton is a hypothetical particle of modern physics that has yet to be directly detected.Mainstream theories (string theory, loop quantum gravity) assume the graviton is a fundamentalparticle. This paper proposes an alternative hypothesis based on complex adaptive system (CAS)emergence theory: the graviton is not a fundamental particle, but rather an emergent phenomenonarising from the collective quadrupole excitations of nucleons (and deeper quark—gluon degrees offreedom) within atomic nuclei in the long-wavelength limit—analogous to phonons being quantizedlattice vibrations.We establish a three-scale theoretical framework (quark—nucleon—nucleus) and verify the mathematical structure of the conjecture through numerical simulations in simplified 3D lattice models:nucleon collective quadrupole oscillations naturally possess spin-2 character, and their mass tends toward zero in the long-wavelength limit. This conjecture bridges the "scale gap" between Sakharov’sinduced gravity (1967) and Verlinde’s entropic gravity (2011)—providing a concrete microscopicmechanism for emergent gravity.We present three independent numerical approaches (static Hessian diagonalization, QCD-inspiredbag model, and molecular dynamics time evolution) that converge on the existence of intrinsic lowenergy spin-2 collective excitations in nuclear matter with ω ∼ 0.6—2.0 MeV. We discuss the relationship with the fractional quantum Hall (FQH) emergent graviton, the Weinberg—Witten theoremand four pathways around it, and propose three experimentally testable predictions accessible withcurrent nuclear physics facilities.