Invertebrate

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Across
  1. 2. the organ posterior to the crop in earthworm to grind food
  2. 6. cnidarian body form that is umbrella-shaped w/ tentacles
  3. 8. innermost primary germ layer in an animal embryo
  4. 10. hard covering on the outside of some animals
  5. 14. a muscular blood vessel from the dorsal and ventral parts of an animals body
  6. 16. an opening in a sponge where water exists
  7. 18. method in which food particles are filtered from the water as it passes by or through some part of the organism
  8. 20. the divison of the body of an organism into a series of similar parts
  9. 21. internal network of fluid filled canals involved in feeding, respiration, internal transport, elimination of wastes, and movement in enchinoderms
  10. 24. system where blood moves thru vessels into open spaces around organs
  11. 28. rhythmic muscular contractions that move food through digestive system
  12. 29. an animal that can produce both egg and sperm
  13. 32. any of the flagellate cells that line the cavities of a sponge
  14. 33. back end of bilateral symmetrical organism
  15. 34. in insects, a series of chemically-controlled changes in body structure from juvenile to adult
  16. 35. a body cavity that is completely lined by mesoderm and that contains internal organs
  17. 36. arrangement of body structures
  18. 37. the periodic shedding of an old exoskeleton
Down
  1. 1. animal with a backbone
  2. 3. sphere shaped collection of amebocytes surrounded by spricules which can grow into a new sponge
  3. 4. small cluster of nerve cells
  4. 5. stinging structure on tentacles of cnidarians that is used to paralyze or kill prey
  5. 7. system in which blood moves through the body entirely enclosed in vessels
  6. 9. a rasping, tonguelike organ that is covered with chitinuos teeth and that is used for feeding by many mollusks
  7. 11. organism that is permanently attached to a surface
  8. 12. organism that survives by living and feeding either inside or attached to outer surfaces of another organism doing harm to the host
  9. 13. gathering of sense organs/nerve organs into the head region
  10. 15. animal without a backbone
  11. 17. 5 symmetrical parts
  12. 19. any structure, such as a leg or antenna, that grows out of an animals body
  13. 22. arrangement of body parts of an organism that they repeat around an imaginary line drawn through the centre of the organism
  14. 23. immature stage of organism that is unlike adult form in appearance
  15. 25. a free-swimming, cilliated larva of many worms and some mollusks
  16. 26. internal skeleton
  17. 27. resting stage of metamorphosis in which tissues of insect are organized in adult form
  18. 30. an independent and immature form of an organism that is morphologically different from the adult
  19. 31. cnidarian body form that is tube-shaped w/ mouth surrounded by tentacles
  20. 35. food storing organ in an earthworm
  21. 37. thin delicate layer of tissue that covers most of a mollusks body and secretes the shell when one is present