Unit 5 List 1- Grade 8

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Across
  1. 3. Birds have a __________ structure in their bones to help them fly.
  2. 6. A pterosaur’s __________ could reach over ten meters.
  3. 9. Early insects were the first animals to achieve __________.
  4. 10. Animals __________ over many generations to adapt to their environments.
Down
  1. 1. __________ birds developed before mammals in the evolutionary timeline.
  2. 2. Large birds can __________ by letting the wind carry them.
  3. 4. The __________ of an animal affects how easily it can fly.
  4. 5. Animals __________ their wings to generate lift.
  5. 7. All life on Earth was __________ to land and water millions of years ago.
  6. 8. Many species __________ through the air without flapping their wings.