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Darwin and Evolution

Darwin and Evolution. Key: AWL to Study , Low-frequency Vocabulary. Who is Charles Darwin? What is evolution?. 1831–1836: Voyage of Exploration. Darwin traveled on the Beagle . knew the Earth was very old knew fossils represented extinct species

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Darwin and Evolution

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  1. Darwin and Evolution Key: AWL to Study, Low-frequency Vocabulary Who is Charles Darwin? What is evolution?

  2. 1831–1836: Voyage of Exploration • Darwin traveled on the Beagle. • knew the Earth was very old • knew fossils represented extinctspecies • knew living organisms were related in groups Where did Darwin travel on his voyage of exploration?

  3. Ambitious Naturalist • Darwin knew that whoever solved the problem of how new species originated would become famous. Would you like to explore the natural world like Darwin? Explain.

  4. Darwin’s Journal: 1838 • Natural selection is a process. • Traits that enhance survival become progressively more common in successive generations. • These animals reproduce more. • These traits become more pronounced. How does natural selection work to form a new species?

  5. Discoveries • Process of natural selection explains the origin of adaptation. • When adaptations are combined with geographicalseparation, this could explain the origin of species. How does natural selection explain the origin of adaptation?

  6. A Controversial Idea • Darwin feared enormous consequences. • did not publish for 20 years • gathered additional evidence Why was Darwin’s idea controversial?

  7. Bombshell • A letter from Wallace • Wallace also had the idea of natural selection. If you were Darwin, what would you have done after receiving Wallace’s letter?

  8. Darwin’s Reaction: Despair • He thought the honorablecourse of action would be to let Wallace publish alone. • Prominentfriends encouraged Darwin to arrange for a joint publication. • Darwin and Wallace published back-to-back papers in 1858. What might have happened if Darwin hadn’t published at this time?

  9. Working Rapidly • 1859: Darwin rushed to press with a book. • assembling materials, summarizing evidence and making interpretations • Darwin publishes The Origin of Species by Means of Natural Selection. • The first print run of the book sells out on the first day. Why do you think the book sold out?

  10. A Sensation • The most controversial implication: • Humans descended from apes. • The book also explained the astonishingdiversity and precise adaptation of living things. Why do you think the book was thought to be so controversial?

  11. Darwin’s Words • To contemplate a tangled bank… • plants of many kinds • birds singing in the bushes • insects flitting about • worms crawling around Do you like to contemplate nature? Why or why not?

  12. Darwin Reflects • Elaboratelyconstructed forms, different from and dependent upon each other in so complex a manner, are produced by laws. • Endless forms have been and are being evolved. Explain how certain laws have created the diversity of species.

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