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Evolution vs. Theory of Evolution

Evolution vs. Theory of Evolution. Evolution – change over time Theory – origins of organisms. Plato (427-347 BC). Believed in two worlds: Real World – ideal, perfect Illusionary World – perceived through senses, can see imperfection. No need for evolution b/c everything is perfect.

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Evolution vs. Theory of Evolution

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  1. Evolution vs. Theory of Evolution Evolution – change over time Theory – origins of organisms

  2. Plato (427-347 BC) • Believed in two worlds: • Real World – ideal, perfect • Illusionary World – perceived through senses, can see imperfection

  3. No need for evolution b/c everything is perfect

  4. Aristotle (384-322 BC) Student of Plato Organized ladder or scale of organisms and nature Each organism had own step

  5. All organisms perfect so no evolution necessary

  6. Ladder never changed Complex on top Simple on bottom

  7. George Curvier (1782-1832) Developed palentology Study of fossils

  8. Relative Dating Compared fossils to current organisms Similarities faded in deeper layers Theory of Catastrophism: each layer represents an event (drought/flood), fossils were victims, remaining organisms either survived or immigrated

  9. Each layer housed organisms that resembled current organisms

  10. Jean Baptiste Lamarck Compared living organisms to fossils Found similarities Traced descent

  11. Theory of Use – Disuse: body parts used will become strong while those not being used will disappear Ex. Long neck giraffes, reaching for food Inheritance of Acquired Characteristics: Once organism develops these “strengths”, passed on to offspring would be advantageous Ex. Necks stretched long

  12. Charles Darwin Explored new regions of Earth along South American coastline At age 22, selected to be the naturalist aboard the HMS Beagle Darwin Discovery

  13. Theory of Natural Selection: Mechanism of change over time, adaptation over time Found in the beaks of finches along Galapogos Islands

  14. Thomas Malthus Economist Human Population Bomb

  15. Thomas Malthus “The human population grows faster than the Earth. As a result of this large population, we experience death, starvation, and competition”

  16. Publication “ On the Origin of Species” remains controversial.

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