gbrightwell gbrightwell

14-01-2019
SAT

contestada

Earth's atmosphere is unique among the planets and is able to support life because it contains a large amount of ___________. A) oxygen B) helium C) methane D) carbon dioxide

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ivana2103 ivana2103

14-01-2019

Oxygen. Most living beings need air to breathe (and therefore live), and air (our atmosphere) contains about 21% oxygen.

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owentout owentout

16-01-2019

OXYGEN!!! What a great thing it is...

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