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KEY CONCEPT Darwin s voyage provided insight on evolution.

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KEY CONCEPT Darwin s voyage provided insight on evolution.

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    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. An adaptations is a feature that allow an organism to better survive in its environment.

    4. Darwin observed fossil and geologic evidence supporting an ancient Earth.

    5. He saw land move from underwater to above sea level due to an earthquake.

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