Oxygen<span>, </span>sulfur<span>, </span>nitrogen<span>, and </span>hydrogen<span>.
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Sometimes some questions don't have a submit button. This happened to me and I know that you just have to move onto another question. Then when you find one that has an answer button you type in you answer and press the answer button for points.
ATP is the most important product of the krebs cycle(36 moles)
