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15
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It is a mixture of different gases that surround the earth. (Attracted by gravity)
atmosphere
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15
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Is a chemical substance that remains without any change in its quantity and structure during the chemical reaction.
catalyst
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15
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the percentage of oxygen in the atmosphere
21
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The most abundant gas.in atmosphere
nitrogen
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heart
Other team wins 25 points!
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fairy
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5
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15
20
25
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shark
Other team loses 15 points!
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thief
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5
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15
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25
15
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we can prepare oxygen on lab
True
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15
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It is a mixture of different gases that surround the earth
Atmosphere
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eraser
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rocket
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rocket
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lifesaver
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15
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Represents 78% of the atmosphere
Nitrogen
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15
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Importance of atmosphere
correct
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