1. Ch. 34

2. Characteristics Notochord Dorsal, hollow nerve cord Muscular post-anal tail Gill slits

3. Gills

4. Simple Chordates Urochordata – tunicates Cephalochordata – lancelets

5. Challenges Faced Chasing food Grabbing food when close Getting oxygen from environment Getting oxygen through body Preventing dehydration Maintaining body temperature Keeping embryos from drying out

6. Fish Agnathans

7. Fish Evolution of jaws

8. Fish - Chondrichthyes Lateral line

9. Fish - Osteichthyes Operculum Swim bladder

14. Class Amphibia

15. Gills as juvenile Lousy lungs Moist skin

16. Class Amphibia Improved circulation

17. Class Reptilia

18. Paraphyletic

19. Class Reptilia Dry skin Amniotic eggs Internal fertilization

20. Class Reptilia Branching in lungs

21. Class Reptilia Partial septum in heart

22. Class Aves

23. Lightweight, hollow bones Large breastbone

24. Class Aves Feathers

25. Class Aves Endothermy

26. Class Aves Four-chambered heart

27. Class Aves Best lungs – one-way respiration

28. Class Aves

29. Class Mammalia

30. Mammary glands Hair Specialized teeth

34. Class Mammalia Monotremes

35. Class Mammalia Marsupials

36. Class Mammalia Eutherians