Phylogeny of musculoskeletal system

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