iris31
iris31
10-04-2017
Chemistry
contestada
what is oxygen I really don't know ad people are mean
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darkmirror
darkmirror
10-04-2017
oxygen is a element in the periodic table. with out oxygen we would not have water because H2O it's made with oxygen. we breathe oxygen, we can't live without it.
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sd123456789
sd123456789
10-04-2017
The thing you breathe
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