11. The oxygen cycle is a delicately balanced process. Which of these however can upset this balance?
(a)Ozone depletion and acid rain.
(b) Deforestation and excessive burning of fossil fuels.
©Excessive use of fertilizers and pesticides.
(d)Overpopulation and deforestation.
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Answer:
(b) Deforestation and excessive burning of fossil fuels.
Answered by
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Answer:
b
Explanation:
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