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label Geology
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schedule 0 Hours
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1)which gas is present in the greatest amount in our atmosphere?

2)What would happen if our planet had pure oxygen to breath?

3)How do human & animals get the nitrogen they need to build proteins?

4)What is air?

Mar 10th, 2015

1 : - Oxygen

2 : - not possible

3 : - from the food 

4 : - combination of gases

Mar 10th, 2015

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Mar 10th, 2015
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Mar 10th, 2015
Aug 18th, 2017
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