In evolutionary biology , abiogenesis , or informally the origin of life OoL ,    [a] is the natural process by which life has arisen from non-living matter, such as simple organic compounds. There are several principles and hypotheses for how abiogenesis could have occurred. The study of abiogenesis aims to determine how pre-life chemical reactions gave rise to life under conditions strikingly different from those on Earth today. Life functions through the specialized chemistry of carbon and water and builds largely upon four key families of chemicals: lipids cell membranes , carbohydrates sugars, cellulose , amino acids protein metabolism , and nucleic acids DNA and RNA. Any successful theory of abiogenesis must explain the origins and interactions of these classes of molecules.
What Are The Advantages And Disadvantages Of Product Theory
Product life-cycle theory - Wikipedia
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The Age of Enlightenment also known as the Age of Reason or simply the Enlightenment [note 2] was an intellectual and philosophical movement that dominated the world of ideas in Europe during the 17th and 18th centuries. The Enlightenment emerged out of a European intellectual and scholarly movement known as Renaissance humanism and was also preceded by the Scientific Revolution and the work of Francis Bacon , among others. French historians traditionally date its beginning with the death of Louis XIV of France in until the outbreak of the French Revolution. Most end it with the beginning of the 19th century.