why is oxygen an element

Physics
Tutor: None Selected Time limit: 1 Day

it cannot be broken down into a simpler substance through chemical means

it combines with hydrogen

it burns

it is essential to life

Mar 19th, 2015

it combines with hydrogen

Mar 19th, 2015

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Mar 19th, 2015
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Mar 19th, 2015
Dec 5th, 2016
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