The Puzzle of Life’s Diversity

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The Puzzle of Lifes Diversity

• Section 151
• This section outlines Charles Darwins
  contribution to science. It also describes the
  pattern of diversity he observed among organisms
  of theGalápagos Islands.

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Introduction

• The process by which modern organisms have
  descended from ancient organisms is called .
• Evolution

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Introduction to Darwin

• A well-supported explanation of phenomena that
  have occurred in the natural world isa(an) .
• Theory

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Introduction to Darwin

• Is the following sentence true or false?
• Charles Darwin contributed more to our
  understanding of evolution than anyone else.
• True

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Voyage of the Beagle

• Circle the letter of each sentence that is true
  about Charles Darwin.
• a. He was born in 1809.
• b. He was an English naturalist.
• d. The voyage lasted 5 years and took him around
  the world.

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Voyage of the Beagle
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Voyage of the Beagle

• Is the following sentence true or false? Darwin
  was looking for a scientific explanation for the
  diversity of life on Earth.
• True

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Darwins Observations
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Circle the letter of each observation that
Darwin made.

• An enormous number of species inhabit Earth.
• Some species that lived in the past no longer
  live on Earth.

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• The preserved remains of ancient organisms are
  called .
• Fossils

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As Darwin studied fossils, what new questions
arose?

• He wondered why so manyspecies had disappeared
  and how they were related to living species.

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• Is the following sentence true or false?
• Of all the Beagles ports of call, the one that
  influenced Darwin the most was the Galápagos
  Islands.
• True

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Circle the letter of each choice that is true
about the Galápagos Islands.

• The higher islands have more rainfall.

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• How did Darwin explain differences in shell
  shape of tortoises from Hood Island andIsabela
  Island?
• Darwin thought that Hood Island tortoises had
  curved shells to allow them to reach the sparse
  vegetation on their island, whereas Isabela
  Island tortoises had dome-shaped shells because
  vegetation on their island was more abundant and
  closer to the ground.

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• Darwin observed that small brown birds on the
  Galápagos Islands differed in theshape of their
  .
• Beaks

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The Journey Home

• What did Darwin think about on his journey home
  to England?
• Darwin thought about how the characteristics of
  many animals and plants, including mockingbirds
  and tortoises, varied noticeably among the
  different islands of the Galápagos.

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• After he returned to England, what hypothesis
  did Darwin develop to explain his findings?
• Separate species evolved from a common ancestor
  after becoming isolated from one another on
  different islands of the Galápagos.

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