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1 vote
Please you can help me with this questions #14, #15 , #16 and #18. Thanks.

Please you can help me with this questions #14, #15 , #16 and #18. Thanks.-example-1

1 Answer

3 votes
I only know one, sorry. Number 14 is CO^2 Carbon Dioxide it is what we exhale.
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User David Cholt
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