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Across
  1. 4. Some animals have this hard covering around their soft bodies.
  2. 6. Some invertebrates have this hard covering on the outside of the body.
  3. 7. Fish use these to breathe underwater.
  4. 8. Fish use these to help them swim.
Down
  1. 1. Birds are covered with these.
  2. 2. A row of bones along an animal’s back.
  3. 3. Mammals use these organs to breathe air.
  4. 4. Many reptiles have dry ______.
  5. 5. A bird uses this hard mouth part to eat.
  6. 8. Many mammals have hair or ______.