CHAPTER 3&4

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Across
  1. 6. They are represented at first only by splinters of primitive bone lacking true bone cells
  2. 8. Output force and output speed are opposites
  3. 10. A saclike membrane that holds the developing embryo in a compartment of water
  4. 12. A vertebrate whose embryo is wrapped in an amnion
  5. 15. Literally means four-footed; amphibians, reptiles, birds, and mammals
  6. 16. Meaning "shell" and "skin"
  7. 18. Rate of change in its velocity
  8. 19. Amount of space
  9. 20. Describes the effects of one body acting on another through their respective mass and acceleration
  10. 24. Inner part of the tooth
  11. 25. A concept of inertia, a property of matter
  12. 27. A concept of the flow of events
  13. 28. Where acting forces are unbalanced
  14. 30. Means "spiny forms"
  15. 31. Fishes without jaws
  16. 33. Shark and rays
  17. 34. Cartilaginous fishes
  18. 37. Cell division and proliferation under stress
  19. 39. Vertebrates with jaws
  20. 40. Meaning "plate" and "skin"
Down
  1. 1. The most diverse of any vertebrate group
  2. 2. Helps us to calculate vector values when we use such a reference system
  3. 3. A prokaryotic, bacterium-like organism, is at the bottom
  4. 4. Opposing weights seated on opposite ends and on the distances of these weights from the pivot point
  5. 5. An enamel-like substance that gave them their name of ganoid scales
  6. 7. An extinct group of mammals that comprise 18 known genera from the early Cenozoic
  7. 9. The tendency of a body to resist a change in its state of motion
  8. 11. The anterior clustering of specialized sensory organs
  9. 13. Bony fishes
  10. 14. The tendency of a submerged object in a fluid to sink or to rise
  11. 17. Nearsightedness, image focused in front of the retina
  12. 21. The change in shape in correlation with a change in size
  13. 22. Organisms that has less requirements for survival
  14. 23. Rate of change in an object's position
  15. 26. Study of size and its consequences
  16. 29. Inspires the other name, craniates, it usually includes the cephalized nervous tissue, constitutes the head
  17. 32. Describes growth in which the proportions remain constant, and neither positive nor negative allometry occurs
  18. 35. The resisting force, may arise from various physical phenomena
  19. 36. A solid cylindrical body that often encloses the notochord
  20. 38. A force acting at a distance from the fulcrum tends to turn the seesaw about this point of rotation