The role of nonvalence, e.g., sea quarks and/or meson degrees of freedom in static and quasistatic baryon electroweak observables, is discussed within the phenomenological sum rule approach. The inclusion of nonvalence degrees of freedom in the analysis of baryon magnetic moments is shown to explain extremely strong violation of the standard SU(6)-symmetry based quark-model prediction for the magnetic moment ratio R_S/L=(S⁺ + 2S^-)/(-L) 0.23, while the value R_S/L(SU(6))=1 corresponds to the nonrelativistic quark model. We also obtain F/D=0.72 for the quark-current-baryon couplings SU(3)_f ratio. The implications for "strangeness" magnetism of the nucleon, and for the weak axial-to-vector coupling constant relations measured in the lowest octet baryon b decays are discussed.

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