How the Chickadee Weathers the Winter

19. 19. What difference between chickadees and humans helps chickadees withstand weather that would be harmful to humans?

• A. the feathers covering the bodies of chickadees

• B. the way chickadees fly around to stay warm

• C. the nests that chickadees build in trees

• D. the northern regions where chickadees live

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17. 20. According to the article, the unusual way blood flows to a chickadee's feet has an effect on?

• A. how the chickadee makes nests in trees

• B. how the chickadee walks

• C. how the chickadee flies

• D. how the chickadee keeps from freezing

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21. 21. Which central idea do the details in paragraph 5 of "How the Chickadee Weathers the Winter" suggest?

• A. Winter can be a very difficult time for chickadees.

• B. Chickadees have fewer feathers in warmer months.

• C. Chickadees use their feathers to defend themselves.

• D. Air travels easily through the chickadees' feathers.

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23. 22. How does the author organize the ideas in the article?

• A. She describes the steps in sequence of chickadees growing more feathers in winter.

• B. She compares how chickadees behave in the winter with the ways humans behave.

• C. She tells personal stories of chickadees she has seen in the wild during winter.

• D. She presents the problem of winter weather and tells how chickadees solve the problem.

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24. 23. Which best describes the central idea of the article?

• A. Humans have scarves and boots to keep them warm. Chickadees do not have clothing.

• B. Chickadees eat a lot of food in the winter. The food changes into energy to heat their bodies.

• C. To survive cold winter weather, chickadees eat constantly. They nest together, and their bodies have special ways of keeping warm.

• D. Feathers have tiny hooks called tiny hooks called barbs. They make a windproof barrier, and the feathers keep chickadees warm in the winter.

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