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Across 1. gas exchange across the skin is caled...........respiration 4. lobe finned fish are also know as this 10. lampreys are members of this class 12. Terrestrial vertebrates are called..............? 14. The subphylum in which a vertabrae surrouns nerve cord and serves as primary axial support is? 15. amphibians excrete urea and ........................? 17. Large oily......... makes sharks buoyant 18. Most fish have............. line system 20. ..................lack tails and possess adaptations for jumping and swimming.

Down 1. .................... are tropical worm like burrows, found in the Gymnophiona order 2. ......... on the head of sharks helps find prey and navigate 3. Evolutions of some fishes let to the .......................... vertebrates 5. order in which caecilians are members of 6. order in which salamanders belong to 7. ........ salmon change colors. 8. ........................ are bony fish with jaws, pared fins, and bone and cartlidge in there skeletons. 9. Sharks, skates, rays, and ratfishse belong to this class 11. most adult amphibians are carnivores and feed on many different.............? 13. salmon follow ............. cues in the ocean. 16. Hagfishes are member os this class 19. Development of............ and paired fins allowed better movement and increased ability to capture prey