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This Concept Map has information related to: ch. 20 David Kay, Origin ???? Chemical evolution, 4 needs are water, minerals, and gasses, 4 needs are absence of oxygen, Era's marked by mass extinction, cells 1st prokaryotic heterotroughs, Hypothosises are iron-sulfer world hypothisis, Era's 2ND Palieozoic, Origin different Era's, cells has endosymbiont theory, macromolecules the RNA world