8LS1 Ch6.2 Text & Questions

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1. Describe Who was Charles Darwin?

• Charles Darwin was an English naturalist

• Charles Darwin was an English naturalist who, in the mid-

  1800s

• Charles Darwin was an English naturalist who, in the mid-

  1800s, developed the theory of evolution by natural selection.

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What made Darwin become curious about

the organisms that lived on the Galápagos Islands?

• giant tortoises

• He saw that giant tortoises on each island looked different.

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3. Analyze What role do variations have in the theory of evolution by natural selection?

• variation helps an organism survive

• variation helps an organism survive in its environment

• If a variation helps an organism survive in its environment, it

  increases in the population through natural selection.

Using the diagram - 4. Illustrate Which are all the

tortoises in the figure that have short necks? Which are all long necks? What trend do you see over

time?

Which ids the best answer?

• All of the tortoises in image 1 should be labeled S. The tortoise

  in the front of image 2 should be labeled L; the other three

  should be labeled S.

• Over time, tortoises developed longer

  necks.

• All of the tortoises in image 1 should be labeled S. The tortoise

  in the front of image 2 should be labeled L; the other three

  should be labeled S. All of the tortoises in images 3 and 4

  should be labeled L. Over time, tortoises developed longer

  necks.

• All of the tortoises in images 3 and 4

  should be labeled L.

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What is the best answer to #5?

Explain How do variations lead to adaptations?

• Beneficial variations spread

• Beneficial variations spread to entire populations

• Beneficial variations spread to entire populations through

  natural selection and produce adaptations

• Beneficial variations spread to entire populations through

  natural selection and produce adaptations that enable the

  populations to survive in their environments.