Zoology crossword puzzle

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Across
  1. 4. No backbone
  2. 8. produce both egg and sperm
  3. 10. arm-like structures for grabbing food
  4. 11. cells they all work separately from each other
  5. 12. can be broken in half and both halves can grow back and continue to live
  6. 13. Has nucleus
  7. 15. attaches to the intestine of the host to eat already digested food.
Down
  1. 1. Simplest of all animals
  2. 2. arrangement of body parts
  3. 3. Has backbone and spinal cord
  4. 5. attached to one place their entire life time
  5. 6. The study of animals
  6. 7. one cell no nucleus
  7. 9. there is no order to body parts
  8. 14. symmetry