Biology - Chapter 24

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Across
  1. 7. upper surface of bilaterally symmetrical animals
  2. 9. stinging cell
  3. 11. outside
  4. 13. muscle, circulatory, excretory
  5. 15. lower surface of bilaterally symmetrical animals
  6. 17. produces both eggs and sperm in the same body
  7. 20. inside
  8. 21. sperm and egg combine inside the animal's body
  9. 22. middle
  10. 23. head end of bilateral animals where sensory organs are often located
  11. 24. skin, nerve
  12. 26. fluid-filled body cavity completely surrounded by mesoderm
  13. 27. body plan that tends to concentrate nervous tissue and sensory organs at the anterior end
Down
  1. 1. sperm and egg combine outside the animal's body
  2. 2. animal without a backbone
  3. 3. an animal without a coelom
  4. 4. fertilized egg cell
  5. 5. cnidarian body form in which the body is umbrella shaped with tentacles that hang down
  6. 6. organism that attaches to one place and stays there
  7. 8. term describing the arrangement of an animal's body
  8. 10. capsule holding a coiled, threadlike tube containing poison and barbs
  9. 12. fluid-filled body with mesoderm
  10. 14. animal with an endoskeleton or backbone
  11. 16. tail end of bilaterally symmetrical animals
  12. 18. digestive tract lining and organs
  13. 19. two-cell-layer sac with an opening at one end
  14. 25. fluid-filled ball of cells formed during early embryo development