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