Let me clarify: The most abundant elements in the universe are Hydrgoen, Helium, Carbon and Oxygen. Helium is inert. So the three most abundant, and chemically active, ingredients are the top three with which life on earth is comprised.

I would've thought you knew this?
Indeed, I'm rather certain we've had this discussion before.

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"Where the telescope ends, the microscope begins. Which of the two has the greater view?" - Hugo

"Men occasionally stumble over the truth, but most pick themselves up and hurry off as if nothing had happened." - Churchill