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Table 2

“Nature” vs. “nurture” summary.

Evidence “Nature” “Nurture” ?

Laboratory studies of refractory carbonaceous materials X X
Ion irradiation and colors of C-rich materials X
The nature of interstellar organics X
Hydrocarbonaceous dust in the ISM X
Dense clouds X
Evolution of organics from diffuse interstellar clouds to the solar system X
Chemistry of protoplanetary disks X
Evidence for organics in dusty disks X
Refractory organic matter in chondrites and interplanetary dust X X
Asteroids 24 Themis & 65 Cybele X
Comets X X
The surface composition of Jupiter Trojans X
PAHs and aliphatic hydrocarbons on Iapetus X X
The surface composition of trans-Neptunian objects and centaurs X X

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