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Across 1. narrow chamber that shoots water to proper cephalopods forward 4. clams, scallops, oysters, and mussels 9. layers of soft muscle tissue that hold an softens food until it goes to the gizzard 12. very sharp chain like teeth 14. a flightless bird 15. lower chambers of the heart 19. outside layer of skin that surrounds the internal glands of mollusks 20. mammals that range from bats to whales 21. frogs and toad 23. crustaceans get oxygen with these structures 26. this is how some amphibians survive the cold 27. small crustacean that is a major link in the marine food chain 28. pouched mammals that give birth very early 32. reptiles are this kind of eater 33. arthropods with one pair of legs per segment 36. mass of soil, mud, or sand thrown up by an earthworm 37. releases powder on feathers for water proofing 39. upper chambers of the heart 41. study of fish 43. cephalopds shoot this distract predators 44. tiny holes in the side of the body that some arthropods use to breathe 47. animals that have no backbone 48. aquatic arthropods that have a body covered with a hard shell 49. helps keep fish afloat 50. tubules that empty into junction between midgut and to the hindgut 53. snails and slugs 56. 85% of all known animals in the world are in this class 57. color of insects blood 58. collection of internal organs and the digestive system of mollusk 59. newts and salamanders

Down 1. segmented structures on worms 2. type of circulatory system in arthropods 3. this fish in the school is in control 5. some arthropods use these to see in the dark 6. bony fish have this many chambers in their heart 7. outer layer of living tissue on segmented worms 8. large birds that hunt and kill other animals 10. gill cover 11. midsection of insects 13. caecilians 16. warm air pockets that give birds elevation 17. eggs of amphibians lack this nutrient 18. this substances in the stomach of amphibians break down food 22. egg-laying mammals 24. adaptation of mammals that live in the arctic 25. fish that can swim backwards 29. one species evolves to look like another species 30. tube that goes from kidneys to cloaca in birds 31. organ that stores vitamins and makes bile 34. class name of hagfish and lamprey 35. flatworms 38. organs that help desert mammals live on small amounts of matter 40. yellow-green liquid that helps absorb and digest food 42. squid and octopi 45. types of bones that allow birds to good their feathers 46. spines of jawless fish are made of this 51. organ that kneads and crushes food 52. type of bones in birds 54. scales on reptiles prevent them from absorbing this gas 55. pearls start off as this inside the mollusk