Phylogeny of musculoskeletal system

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