2. Parasitic Flatworm That May Live in More Than One Host

Invertebrates Across 2. Parasitic flatworm that may live in more than one host 3. Jaws 4. Asymmetrical animal 9. Have a two-part hinged shell 13. Tubes in arthropods to remove nitrogen wastes 14. Mollusk with eight tentacles 17. Middle stage during incomplete metamorphosis 18. Glands in crayfish to remove nitrogen wastes 19. The ability of animals to break into pieces and regrow parts 24. Living attached to a surface or substrate 26. Number of legs on insects 27. Terrestrial crustacean that can roll into a ball 28. Flexible protein making up a sponge’s skeleton 30. Lives in the ocean or seas 32. Clams, oysters, snails, and squid 34. Have a single shell like snails 37. Number of legs on an arachnid 38. Sting cells in a jellyfish’s tentacles 40. Type of digestive tract in roundworms 42. Symmetry in which the organism has a right and left side that are mirror images 46. First body section of an arachnid or spider 51. Animals with a partially lined body cavity 52. Tough muscular tissue in mollusks that protects their body organs 53. Jellyfish have this cnidarian body form 54. Produced by squids to cloud water and escape predators 55. Appendages of arthropods 56. No pattern in the arrangement of body parts

Down 1. Producing both eggs and sperm 5. Top or back side of an organism 6. Vegetarian arthropod with 2 pairs of legs per body segment 7. Fangs 8. Shedding of the exoskeleton 10. Animals without a lined body cavity 11. Group of invertebrates with radial symmetry 12. Has three body layers and a flat shaped body 13. Jellylike material between the two cell layers in cnidarians 15. Produce silk in spiders 16. Metamorphosis from egg to larva to pupa to an adult 20. Body cavity in cnidarians 21. Large opening at the top of a sponge where excess water leaves 22. Also called calcium carbonate and makes up the case of corals 23. Predaceous arthropods with one per of legs per body segment and poison claws 25. Lives in water 29. Microscopic organisms used as food by filter feeders 31. Type of feeding in which food is strained from the water 33. Bristles on the underside of earthworms for movement 35. Front or underside of an animal 36. Flagellated cell that brings food and water into a sponge 39. Where parasitic animals live 41. Cells in flatworms to remove nitrogen wastes 43. Segmented worms 44. Fluid filled body cavity in earthworms that serves as their skeleton 45. Type of digestive tract in cnidarians 46. Pincers 47. Cnidarian with upright tentacles 48. Membrane on arthropods that detects sound 49. Having an anterior or head end where sensory organs are concentrated 50. System used by echinoderms to move, feed, and reproduce