2. science

3. science organized way of using evidence to learn about the natural world; also, the body of knowledge that scientists have built up after years of using this process

5. observation

6. observation use of one or more of the senses—sight, hearing, touch, smell, and sometimes taste—to gather information

8. data

9. data evidence; information gathered from observations

11. inference

12. inference logical interpretation based on prior knowledge and experience

14. hypothesis

15. hypothesis possible explanation for a set of observations or possible answer to a scientific question OR an educated guess

17. Spontaneous generation

18. Spontaneous generation hypothesis (disproven) stating that life could arise from nonliving matter

20. controlled experiment

21. controlled experiment a test of the effect of a single variable by changing it while keeping all other variables the same

23. manipulated variable

24. manipulated variable factor in an experiment that a scientist purposely changes; also known as independent variable

26. responding variable

27. responding variable factor in an experiment that a scientist wants to observe, which may change in response to the manipulated variable; also known as a dependent variable

29. theory

30. theory well-tested explanation that unifies a broad range of observations

32. biology

33. biology science that seeks to understand the living world

35. cell

36. cell collection of living matter enclosed by a barrier that separates the cell from its surroundings; basic unit of all forms of life

38. sexual reproduction

39. sexual reproduction process by which cells from two different parents unite to produce the first cell of a new organism

41. asexual reproduction

42. asexual reproduction process by which a single parent reproduces by itself

44. metabolism

45. metabolism set of chemical reactions through which an organism builds up or breaks down materials as it carries out its life processes

47. stimulus

48. stimulus a signal to which an organism responds

50. homeostasis

51. homeostasis process by which organisms maintain a relatively stable internal environment

52. ml

53. metric system ml

54. metric system decimal system of measurement based on certain physical standards and scaled on multiples of 10 ml

56. microscope

57. microscope device that produces magnified images of structures that are too small to see with the unaided eye

59. compound light microscope

60. compound light microscope microscope that allows light to pass through a specimen and uses two lenses to form an image

62. Electron microscope

63. Electron microscope microscope that forms an image by focusing beams of electrons onto a specimen

65. cell culture

66. cell culture group of cells grown in a nutrient solution from a single original cell

68. cell fractionation

69. cell fractionation technique in which cells are broken into pieces and the different cell parts are separated