What percentage of oxygen level in atmosphere causes forest fire?

Less than 20%

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Above 25%

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Less than 10%

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Above 30%

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Solution

The correct options are
B Above 25%
D Above 30%
If the oxygen level is below 15% in the atmosphere, it does not support fire. If the oxygen level is above 25%, it would cause forest fires and other types of fires which are impossible to put out.

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Marks	Less than 10	Less than 20	Less than 30	Less than 40	Less than 50
Number of students	3	11	28	48	70

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Marks	Number of students
Marks less than 10 Marks less than 20 Marks less than 30 Marks less than 40 Marks less than 50	3 11 28 48 70

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