Which of the following is the correct sequence of events in the origin of life?A.  Synthesis of organic moleculesB.  Formation of DNA-based genetic systemsC.  Synthesis of inorganic moleculesD. Formation of RNA-based genetic systems

Oparin of Russia and Haldane of England proposed that the first form of life could have come from pre-existing non-living organic molecules (e.g. RNA, protein, etc.) and that formation of life was preceded by chemical evolution, i.e., formation of diverse organic molecules from inorganic constituents. RNA is believed to be the genetic material of the earliest organisms. DNA-based genetic systems originated later.