Chapter 3&4

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Across
  1. 3. time period were early vertebrae fossil recovered
  2. 7. series of cartilage joined as a backbone
  3. 8. gel-liked core within each vertebral disk
  4. 9. descendants of four-footed ancestor
  5. 10. vertebrates with jaws
  6. 13. SI for mass
  7. 17. produce embryo wrapped in amnion
  8. 20. anterior clustering of specialized sensory organs
  9. 23. middle layer of the long bone
  10. 26. SI for intensity of light
  11. 27. encases the brain
  12. 28. process of moving
  13. 29. encloses the notochord
  14. 30. separated fluid flows in the same direction
  15. 32. support on which lever moves
  16. 34. unit of work
  17. 35. speed in one direction
  18. 37. rate which an object change its velocity
  19. 38. organ for obtaining oxygen from water
  20. 39. study of light and the way it affect things
  21. 40. weight of the air in Earth's atmosphere
Down
  1. 1. slender rod develops from mesoderm
  2. 2. four-footed
  3. 4. animals with spinal column
  4. 5. without amnion
  5. 6. measurements of variables with a magnitude and direction
  6. 11. eel-like scavengers
  7. 12. form of an object
  8. 14. jawless fishes
  9. 15. uniform in motion
  10. 16. power to push or pull objects
  11. 18. unit of electrical power
  12. 19. unit for amount of substance
  13. 21. encases embryo in a protective water compartment
  14. 22. fluid flows in opposite direction
  15. 24. fins placed anteriorly
  16. 25. force applied to an object
  17. 31. fluid-filled central canal
  18. 33. fins located posteriorly
  19. 36. measure of mass per unit of volume