Evolution

1
Evolution

• The Puzzle of Lifes Diversity
• 15-1

2
Charles Darwin

• Born- England 1809
• At age 22, went on Voyage of the Beagle to
  observe evidence for evolution
• Most evidence from GALAPOGOS ISLANDS
• Looked at finches, tortoises, iguanas,
  armadillos, and fish
• Came up with Theory of Natural Selection
• Wrote the book, On the Origin of Species

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Voyage of the Beagle
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Darwins Observations

• Living animals, some captured but most drawn and
  numbered in his journal
• Also collected many fossils
• EX Tortoises on three different islands
• 1. Hood Island long neck and curved/open shell
• 2. Isabela Island short neck and dome shell
• 3. Pinta Island intermediate neck and shell
• WHY? (see pg 371)

5
The Journey Home

• Darwin had time to think and analyze the species
  he noted and collected
• Why did so many resemble others, but were not
  identical?
• Plants and animals alike had minor variations,
  could it be because of isolation or environment,
  or BOTH???