51. Phosphorus cycle is in the form of
52. Which one of the following is a direct ecological factor?
53. The most severe pollutant of metals and materials is
54. Environmental Science may be defined as
55. All the cases of forests land should be approved by
56. In case of CO2 of earth's atmosphere disappears, the temperature of earth's surface would
57. Terrestrial life would become impossible with
58. Chlorofuorocarbons release which of the following chemicals which is harmful to ozone layer
59. Who coined the term biosphere?
60. DDT is banned because
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