51. Mycorrhiza represents
52. Which of the following interactions will not promote co evolution?
53. Earth summit was held in
54. The unit of measurement of intensity of sound is in _________
55. Which of the following spatial units is the largest in terms of scale?
56. Natural earthquakes are caused by __________
57. Eutrophication results from
58. Organisms that feed upon other living organisms as a source of energy and nutrients are called as
59. Nuclear accidents mostly release radioactive __________ into the atmosphere
60. The presence of which is necessary for photosynthesis
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