1. Eastern Screech Owls

2. SCIENCE 7 TOPIC 12

3. Three traits that all chordates share Which ones do we need to know?

4. Three traits that all chordates share Which ones do we need to know? A rod-like, flexible structure for support that is present at least part of the animal’s life

5. Three traits that all chordates share Which ones do we need to know? A.K.A nerve cord extending the length of the body

6. Three traits that all chordates share Which ones do we need to know? A.K.A nerve cord extending the length of the body NervechordNervechord

7. Three traits that all chordates share Which ones do we need to know? Used for respiration and may be present only during the early stages of life

8. Human gill slits. (branchial arches)

9. Human gill slits (a.k.a. branchial arches)

10. So, what are the three groups of chordates? 1 st, just for fun, here are some examples

11. Here is the first of the three chordate groups you should know about: 1. The tunicates

12. a) They are invertebrates, but are still chordates because they have notochords prior to becoming adults

13. 1. The tunicates a) They are invertebrates, but are still chordates because they have notochords prior to becoming adults b. They are filter feeders

14. 1. The tunicates a) They are invertebrates, but are still chordates because they have notochords prior to becoming adults b. They are filter feeders c. They are known as sea squirts

15. Here’s what sea squirts look like on the inside…

16. Here is the second of the three chordate groups you should know: 2. The lancelets

17. a) These are invertebrates that retain their notochord throughout their lives

18. 3. The lancelets a)These are invertebrates that retain their notochord throughout their lives b. As adults they look like fish but are not

19. We already know what lancelets look like on the inside…remember?

20. Here is the third of the three chordate groups you should know: 3. The vertebrates

21. Now, these are the three chordate groups you should know about 3. The vertebrates a) These have backbones

22. 3. The vertebrates a) These have backbones b. Have a skeleton made of living cells

23. 3. The vertebrates a) These have backbones b. Have a skeleton made of living cells c. These have closed circulatory systems

24. 3. The vertebrates a) These have backbones b. Have a skeleton made of living cells c. These have closed circulatory systems d. These have advanced nervous systems

25. 3. The vertebrates a) These have backbones b. Have a skeleton made of living cells c. These have closed circulatory systems d. These have advanced nervous systems e. Warm or cold blooded

26. The three traits all fish share

27. The Growler Dives With The Fishes

28. The three traits all fish share Fish use gills to breathe

29. The three traits all fish share Fish use gills to breathe Fish reproduce using external fertilization

30. The three traits all fish share Fish use gills to breathe Fish reproduce using external fertilization Fish have a two chambered heart

31. The three groups of fish start with the jawless fish

32. -lack scales, fins, and noticeable jaws

33. The three groups of fish start with the jawless fish -lack scales, fins, and noticeable jaws -have worm-like shape

34. The three groups of fish start with the jawless fish -lack scales, fins, and noticeable jaws -have worm-like shape -the hagfish and lamprey

35. The three groups of fish start with the jawless fish

36. The second fish class is the cartilage fish

37. -have scales, fins, and jaws

38. The second fish class is the cartilage fish -have scales, fins, and jaws -no bones – cartilage makes up their skeleton

39. The second fish class is the cartilage fish -have scales, fins, and jaws -no bones – cartilage makes up their skeleton -shark and manta ray

40. Here’s the manta ray…

41. The third class of fish are the bony fish

42. -largest subclass of fish

43. The third class of fish are the bony fish -largest subclass of fish -have scales, fins, and bones

44. The third class of fish are the bony fish -largest subclass of fish -have scales, fins, and bones -perch and tuna

45. Here’s the perch, by the way…

46. The three traits all amphibians share

48. 1. They go through metamorphosis

49. The three traits all amphibians share 1. They go through metamorphosis - hatch from eggs and begin as water dwellers breathing with gills

50. The three traits all amphibians share 1. They go through metamorphosis - hatch from eggs and begin as water dwellers breathing with gills - as adult, they live on land using lungs and moist skin to breathe

51. The three traits all amphibians share 2. They have a three chambered heart

52. The three traits all amphibians share 3. Need to return to water to reproduce

53. The two groups of amphibians 1. The tailless amphibians such as the frog and …

54. The two groups of amphibians 1. The tailless amphibians such as the frog and… toad

55. The two groups of amphibians 2. The tailed amphibians such as the salamander and the…

56. The two groups of amphibians 2. The tailed amphibians such as the salamander and the… NEWT

57. The traits all reptiles share

58. a) Dry scales that hold moisture

59. The traits all reptiles share a) Dry scales that hold moisture b) Lay eggs with leathery shell

60. The traits all reptiles share a) Dry scales that hold moisture b) Lay eggs with leathery shell c) 4 limbs with claws (except the snake)

61. The traits all reptiles share a) Dry scales that hold moisture b) Lay eggs with leathery shell c) 4 limbs with claws (except the snake) d) Most have 3 chambered heart

62. The traits all reptiles share a) Dry scales that hold moisture b) Lay eggs with leathery shell c) 4 limbs with claws (except the snake) d) Most have 3 chambered heart e) Use lungs

63. The traits all reptiles share a) Dry scales that hold moisture b) Lay eggs with leathery shell c) 4 limbs with claws (except the snake) d) Most have 3 chambered heart e) Use lungs f) Int. fertilization

64. The three groups of reptiles 1. The turtles have two shells and an endoskeleton for protection. Some live on land (tortoises) and others in water (sea turtles)

65. The three groups of reptiles 2. The crocodiles and alligators which have 4 chambered hearts

66. The three groups of reptiles 3. The snakes and lizards. Lizards have movable eyelids and have ear openings - snakes do not Both can unhinge their jaws to eat

67. Relax! Thus Ends Our Study of the Three Groups of Reptiles