2. a Flexible Rod of Tissue Along Their Back

ZooSemtest answers

1. Cephalization

2. A flexible rod of tissue along their back

3. Dorsal nerve cord, notochord, pharyngeal pouches

4. Segmentation, exoskeleton, digestive tract

5. Individual cells

6. Acoelomate

7. Echinoderm, chordates

8. Mollusk

9. Occur in some mollusks life cycle, a belt of cilia around their bodies, occurs in some annelids life cycle

10. Eating

11. Bivalves, cephalopods, gastropods

12. Squids

13. May consist of one or more pieces, provide protection, allows the attachment of muscles

14. Blood is released directly into spaces in the body tissues

15. Gills, skin, mantle cavity

16. Chambered nautiluses

17. Segmented body patterns

18. Blood moves more efficiently through the tubes of a closed circulatory system

19. Associated with reproduction

20. Help release nutrients into the soil, aerate the soil as they move through it, break up the soil where they live

21. Use suckers to help move, are segmented, may be parasitic 22. Walking legs, some modified into antennae, modified into pinchers

23. Both waterproof coatings

24. Segmentation, chitinous exoskeleton, jointed appendages

25. Chitin

26. Arthropods

27. Jointed appendages, exoskeleton, segmented bodies

28. Crustacean

29. Spiders, scorpions, horseshoe crab

30. Arachnidan

31. Used to produce silk

32. Used to capture and handle their prey

33. Decaying plants

34. One pair of legs per segment

35. Two wings

36. Reproduce in large numbers, ability to fly, several species can live in the same area without competing for food

37. Insects

38. Wings, 3 body regions, endoskeleton

39. Removes waste

40. Drones and queen reproduction, workers-females

41. Gills, lungs, skin

42. Usually return to water to reproduce

43. Caudate

44. Pumps both oxygenated and deoxygenated, 3 chambered

45. They fertilize externally, jelly-like coating is permeable to water 46. Series of changes in a life cycle

47. Meteorite struck the earth and caused a thick dust cloud

48. Protective membranes in reptile, bird and mammal eggs

49. Amniotic egg

50. Chorion

51. Dry and water tight

52. 2 atria, 1 ventricle, alligators and crocodiles are different

53. By changing the air pressure in their mouths

54. Ecto- rely on the environment to keep their bodies warm, endo- produce heat within their own bodies

55. Chelonian

56. Squamata

57. Heat-sensing organ between the eyes and nostril on each side of the head

58. The spiny crest on their back