Animal Kingdom and Human body

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Across
  1. 2. they have scales but only on their feet
  2. 4. they have scales on their body
  3. 6. this is the a fiber that send messages through the body
  4. 7. act as a barrier to the world
  5. 9. this is the main organ of the respiratory system
Down
  1. 1. they act as filters
  2. 3. it is also known as wishbone
  3. 5. they do not have a nervous system
  4. 7. It heart has four _______________
  5. 8. this is the shorter of the two intestines