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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; those with long beaks live in areas with cactus flowers

  3. Species are able to adapt to their environment. • Adaptations can lead to genetic change in a population. • In Galapagos, the flightless • Cormorant used to have to fly • To obtain food but now, it has no natural predators and swims and dives for fish therefore does not need its wings and is flightless • An adaptation is a feature that allows an organism to better survive in its environment.

  4. Darwin observed fossil and geologic evidence supporting an ancient Earth. • Darwin found fossils of extinct animals that resemble modern animals (below is Glyptodon which is present day armadillo)

  5. Geological evidence: • Darwin’s observations from land, sea and fossil evidence.

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