31.What part of air is oxygen?*
1 point
Three-fourth
one fifth
one fourth
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Answer:
ᴘᴀʀᴛ ᴏғ ᴀɪʀ ɪs ᴏxʏɢᴇɴ
ᴏɴᴇ ғɪғᴛʜ
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