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KEY CONCEPT Darwin’s voyage provided insight on evolution.

KEY CONCEPT Darwin’s voyage provided insight on evolution. Darwin observed differences among island species. Variation is a difference in a physical trait. Galápagos tortoises that live in areas with tall plants have long necks and legs.

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KEY CONCEPT Darwin’s voyage provided insight on evolution.

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  1. KEY CONCEPT Darwin’s voyage provided insight on evolution.

  2. Darwin observed differences among island species. • Variation is a difference in a physical trait. • Galápagos tortoises that live in areas with tall plants have long necks and legs. • Galápagos finches that live in areas with hard-shelled nuts have strong beaks.

  3. Galapagos Islands

  4. Darwin’s Finches

  5. Species are able to adapt to their environment. • Adaptations can lead to genetic change in a population. • An adaptation is a feature that allows an organism to better survive in its environment.

  6. Darwin observed fossil and geologic evidence supporting an ancient Earth. • Darwin found fossils of extinct animals that resemble modern animals. • Darwin found fossil shells high up in the Andes mountains.

  7. He saw land move from underwater to above sea level due to an earthquake. • Darwin extended his observations to the evolution of organisms.

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