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Origin of Life Theories and Experiments

Explore the history of ideas about the source of life, from spontaneous generation to biogenesis, Oparin's hypothesis, and Miller-Urey experiments. Learn how gases like ammonia, hydrogen, methane, and water vapor played a role in the formation of complex compounds essential for life.

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Origin of Life Theories and Experiments

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  1. Section 3Where does life come from? • Spontaneous generation – Early theory that living things could come from non-living things; disproved by Louis Pasteur in the mid-1800s.

  2. Biogenesis – theory that living things come only from other living things.

  3. Alexander Oparin’s hypothesis on the origins of life – gases in Earth’s early atmosphere combined to form more complex compounds found in living things. • Gases: • Ammonia • Hydrogen • Methane • Water vapor

  4. Stanley Miller and Harold Urey tested Oparin’s hypothesis and showed that chemical’s found in living things could be produced.

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