Animal Kingdom - Invertebrates

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Across
  1. 3. tail end
  2. 5. structures that grow and extend from an animal's body
  3. 6. produce both eggs and sperm in the same animal body
  4. 7. series of major changes from a larval form to an adult form
  5. 9. animal that belongs to the phylum Nematoda and are cylindrical unsegmented worms that are tapered at both ends
  6. 14. occurs when egg and sperm combine outside the animal's body
  7. 16. balance among body structures of organisms
  8. 17. attached to and stay in one place
  9. 21. animals without backbones
  10. 24. animals that include sea stars, urchins, and sand dollars
  11. 25. tendency to concentrate nervous tissue and sensory organs at the anterior end of the animal
  12. 27. animal that belongs to the phylum Platyhelminthes and has thin, flat bodies that resemble ribbons
  13. 28. fertilized egg cell
  14. 29. can be divided along any plane, through a central axis, into roughly equal parts
  15. 32. animal that has no tissues, no organs, and no symmetry in the phylum Porifera, live in marine habitat
  16. 33. feeder gets food by filtering small particles from water
Down
  1. 1. hard or tough outer coverings that provide a framework of support
  2. 2. contains fused segments and is at the posterior end, contains digestive sturctures
  3. 4. the animal can be divided into mirror image halves only along one plane through the central axis
  4. 8. middle body region consisting of three fused main segments
  5. 10. occurs when the sperm and egg combine inside the animal's body
  6. 11. animal with two pairs of antennae, two compound eyes, five pairs of legs
  7. 12. animal with antennae, compound eyes, simple eyes, three body sections and three pairs of legs
  8. 13. animal that has an endoskeleton and a backbone
  9. 15. animals that belong to the phylum Annelida and have a body plan consisting of segments
  10. 18. animal with no antennae, two body sections and six pairs of jointed appendages
  11. 19. have the thorax region fused with the head into a single structure
  12. 20. animal with radial symmetry and catches food with tentacles
  13. 22. animals that belong to the phylum Mollusca and have bilateral symmetry, a soft internal body and a muscular foot
  14. 23. underside or belly
  15. 26. internal skeleton
  16. 30. backside
  17. 31. head end