1. D
 2. 6%
 3. B
 4. D & E
 5. C
 6. B
 7. less than 2%
 8. D
 9. 1370
10. 850 to 1000
11. C
12. FALSE!
13. D
14. D
15. B or D
16. C
17. B
18. no more than 2 hp
19. D
22. A
23. C
25. C
26. C
27. D
28. D
29. B
30. D
31. D
32. D & E; A is true, but don't get as much energy per acre, either
33. C
34. a few % (< 6%, typically 1%)
35. D
36. debatable
38. B
39. C
40. 21
41. D
42. E
43. B (two half lives)
44. A
45. B
46. B
47. C
48. A
53. C
54. A
55. primarily C; as a consequence, E
58. A
59. D
60. B
61. A
62. E & D?
64. A thru D
65. A & B