Why do morons such as yourself see extraterrestrial hydrocarbons as something they so clearly are not? Why do you keep chanting, and dancing a strange little dance around every direct question posted at you? Things like the above mantra: "No biological molecule can survive subduction into the mantle." So bloody what? What does this statement actually mean? Have you ever tried to understand the words? Seeing how you seem to have no idea whatsoever, what the meaning of "biological" is? Or what "chemistry" means? You don't know do you? Because you're actually a moron, a real-live chalk-breathing, dancing, singing, one!