Biology - Chapter 24

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