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Lesson 6 of 9

4 min

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A duck paddles across a pond. Look at its webbed feet, with skin joining the toes.

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Webbed feet push through water well.
Step 1 of 4
  1. Webbed feet push through water well.
  2. That fits a water habitat.
  3. A thick fur coat keeps the body warm.
  4. It fits cold mountains, not a hot desert.

The rule

A body part fits when it helps the animal in its habitat.

  • Webbed feet help a duck move through water. Skin between the toes pushes more water with each paddle.
  • A thick coat helps a yak, a mountain animal, stay warm.

Try the lab to finish this lesson.