MS 10.1

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Across
  1. 2. The saclike structure at the top of the tube foot
  2. 3. To cast off one or more arms if disturbed or seized by a predator
  3. 5. Benthic organism that include brittle stars, basket stars and serpent stars
  4. 6. The entrance to the water vascular system
  5. 8. A unique hydraulic system that functions in locomotion, feeding, gas exchange and excretion
  6. 10. Tiny, pincer-like structures around the bases of the spines
  7. 11. Internal skeleton
Down
  1. 1. An opening along the arm that the tube feet protrudes from
  2. 2. The side opposite the mouth
  3. 4. Hollow podia attached to the canals of the water vascular system that has an ampulla at the top and a sucker at the end
  4. 7. Plates of calcium carbonate that lie just beneath the epidermis
  5. 9. A typical one is composed of a central disc and five arms, or rays