Questions with the keyword 'oxygen'

• Why does our planet have oxygen but other planets and moons like Jupiter, the Moon, Saturn etc. not have oxygen. by rebecca.leyland to Huma, Jack, Lucy, Miranda, Peter Comments: (No comments so far )
• Why does the earth have oxygen and all the other planets do not? by Lucy2004simmons to Peter Comments: (No comments so far )
• why do trees breath in carbondioxide and breathe out oxygen by Bubble789 and 1 other. to Lucy, Huma, Jack, Miranda, Peter Comments: (So far, one comment )