GEO 303 Lecture Notes - Lecture 37: Cambrian Explosion, Chlorophyll, Eukaryote
23 Dec 2017
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Lectures 37 & 38: primitive life in different environments. Has existed since at least 3. 5ga, & possibly longer. Indicates that life arose on earth fairly quickly once suitable conditions (liquid water at. Have been around since at least 2. 7ga the surface) were present life may formed fairly easily given the right conditions & materials. Amino acids & many other organic compounds necessary for life can be created by mimicking conditions that were widespread in the early ss (little free oxygen, abundant. The surfaces of clay minerals can act as catalysts to speed organic molecule. Early earth was likely rich in simple organic compounds. Turning these compounds into building blocks for life (proteins, nucleic acid chains) Hydration/dehydration cycles in evaporation ponds or freeze/thaw cycles have requires linking them together ( polymerization ) triggered polymerization. Many are extremophiles , living in very hot or very salty environments. Seawater driven by heat from intruding basalts formed hydrothermal springs.
