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Across 1. amphibians that have bumpy skin and poison glands 3. teeth used for stabbing and holding 7. animals that have to get their heat from the environment 10. group that has strong lower limbs fused, and thick hip bones 12. iguanas, geckos 15. an internal skeleton 16. the ____ flow is when water passes over gills in one direction and blood in the opposite direction 18. organ in land animals that exchanges oxygen and carbon dioxide in the blood 19. frogs and toads 20. jawless fishes retain this from embryo to adulthood 22. found on the frog, similar to our eardrum 23. gas filled sac used to control buoyancy 25. feathers that insulate the baby birds 27. number of chambers in the heart of mammals 28. breastbone in birds 31. hollow teeth that inject venom 33. tuataras 34. what the pit organ senses 35. number of chambers in the heart of most reptiles 37. fins that help fish maintain upright position 38. mammal in which young is born underdeveloped and then crawls to a pouch to finish developing 41. order of reptiles in which the animals ambush prey and head and nostril are on tope of their heads 43. feathers on adult birds that are used for flight 44. example of a marsupial 46. what the Jacobson's organ senses 49. turtles and tortoises 50. most ancient vertebrates 52. monotreme example 54. examples of these fishes are hagfishes and lamprey 56. male sharks use these to insert sperm into the female 57. frogs and toads 58. bony cover over the gills 59. features on birds that can be used to determine diets

Down 2. cartilage fish that are flat to move along the seafloor 4. third eyelid of the fish 5. type of reptiles that do not have movable eyelids 6. `class name of bony fish 8. class name of cartilage fishes 9. gills get this gas out of the water 11. male and female eggs are laid near one another in the water so the eggs can be fertilized 13. primary function of hair in mammals 14. process of using reflected sound waves to find objects, used by bats 17. produces milk, found in chest cavity of females mammals 21. strong muscle between chest cavity and abdominal cavity that aids in breathing 24. mammals that lay eggs 26. caecilians 28. organ that filters blood to get rid of wastes 29. faint line visible on the sides of fish used to detect vibrations 30. top part of the turtle shell 32. opening at rear of cheek of fish in which water moves in and out of it 36. the wall that divides chambers of the heart 39. fins on fish found on the side of the body, steering 40. type of shark that eats plankton 42. teeth used for biting and cutting 45. type of respiration in which amphibians breathe through their skin 47. group of land animals that was first to have an amniotic eggs 48. newts and salamander 51. function of hair/whiskers in cats and dogs 53. teeth used for crushing and grinding 55. where do sharks and rays store their fat