chapter 18 & 19 puzzle

chapter 18 and 19 in zoology

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Across 4. most adult amphibians are carnivores and feed on many different.............? 7. lobe finned fish are also know as this 8. order in which caecilians are members of 13. gas exchange across the skin is caled...........respiration 15. ......... on the head of sharks helps find prey and navigate 16. The subphylum in which a vertabrae surrouns nerve cord and serves as primary axial support is? 18. Large oily......... makes sharks buoyant 19. .................... are tropical worm like burrows, found in the Gymnophiona order 20. Hagfishes are member os this class 21. salmon follow ............. cues in the ocean.

Down 1. Sharks, skates, rays, and ratfishse belong to this class 2. lampreys are members of this class 3. ..................lack tails and possess adaptations for jumping and swimming. 5. Development of............ and paired fins allowed better movement and increased ability to capture prey 6. ........................ are bony fish with jaws, pared fins, and bone and cartlidge in there skeletons. 9. Terrestrial vertebrates are called..............? 10. order in which salamanders belong to 11. Most fish have............. line system 12. Evolutions of some fishes let to the .......................... vertebrates 14. amphibians excrete urea and ........................? 17. ........ salmon change colors.

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