Arthropod & Echinoderm Puzzle

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Across
  1. 1. Bottom dwellers
  2. 4. Type of symmetry based around a central point
  3. 5. Hard outer shell
  4. 8. The ability to bend at joints
  5. 9. Form of protection where internal organs are ejected from the body
  6. 10. Most successful animal phylum
  7. 11. Endoskeleton of echinoderms are made up of ___ carbonate
  8. 12. Pincers commonly found at the base of tube feet in sea stars
Down
  1. 2. Animals that lacks a backbone
  2. 3. A ___-vascular system is used instead of circulatory, respiratory and excretory systems in echinoderms
  3. 6. This type of muscle allow quick, strong, and rapid movement
  4. 7. Shedding of old exoskeleton