Widespread synthesis of complex organics, including nucleobases and ribose precursors, occurred early in the history of the solar system in the solar nebula. These organics, delivered by comets and meteorites to multiple potentially habitable zones (Earth, Mars, Enceladus, Europa, Titan) may have biased the evolution of life towards utilization of similar informational polymers. Meteoritic exchange might also have produced shared ancestry, most plausible for Earth and Mars.