51. Most of the radiation emitted by a human body is in the form of:
52. Solar radiation reaches the earth's surface as:
53. The earth's atmospheric window is in the:
54. Carbon monoxide is a pollutant because it
55. High biological oxygen demand indicates:
56. Environmental education should be in _______ approach.
57. A high density of elephant population in an area can result in
58. The most important human activity, leading to the extinction of wildlife, is
59. The process of successful establishment of the species in a new area is called
60. The order of basic processes involved in succession is
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