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Ozone hole refers to
A. hole in ozone layer
B. decrease in the ozone layer in troposphere
C. decrease in thickness of ozone layer in stratosphere
D. increase in the thickness of ozone layer in troposphere

C. decrease in thickness of ozone layer in stratosphere

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Tell me what a stroke is and what are the types of stroke?	Plants absorb dissolved nitrates from soil and convert them into A. free nitrogen B. urea C. ammonia D. proteins