Across
- 4. at the time of protection it sucks in h20 and shoots it sharply backwards
- 6. moving stage
- 7. parapodia
- 8. developed muscle cells
- 9. ridge formations with beams used for movement
Down
- 1. ragged surface of the body
- 2. piadive movement
- 3. ambulatory system of water vessels
- 4. skin-muscular sac formed from longitudinal and circular musculature
- 5. their limbs can be removed by others