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Biology 7 Online
OpenStudy (anonymous):

Which one is not one of the most common elements of organic compounds? A. hydrogen B. helium C. nitrogen D. phosphorus

OpenStudy (anonymous):

Hello @CavebusterWatcher! In my opinion, I will say it as B: Helium. How about you? What do you think...?

OpenStudy (anonymous):

Thank you @misskitty777 for giving a medal. I am so happy

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