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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

Darwin and Evolution

Key: AWL to Study, Low-frequency Vocabulary

Who is Charles Darwin? What is evolution?

1831 1836 voyage of exploration
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?

ambitious naturalist
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.

darwin s journal 1838
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?

discoveries
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?

a controversial idea
A Controversial Idea
  • Darwin feared enormous

consequences.

    • did not publish for 20 years
    • gathered additional evidence

Why was Darwin’s idea controversial?

bombshell
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?

darwin s reaction despair
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?

working rapidly
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?

a sensation
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?

darwin s words
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?

darwin reflects
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.