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Supersonic jets cause thinning of which layer?
(a)O2 layer
(b)O3 layer
(c)CO2 layer
(d)SO2 layer

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Important Questions on Biology
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Name the main reason behind the death of 23 lions in Gir Forest National Park in 2018.

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HARD

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MEDIUM

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Which of the following is/are plant disease:
I. Citrus canker
II. Hepatitis B
III. Cholera

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