Cliff AP answers

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It cant be FADH2 because FADH2 would be coming from Pathway B ( so it would be an arrow coming from that box specifically). It makes sense for arrow 9 to be O2 because it is the final electron acceptor in the ETC. According to the answer key, it could also have been ADP, but ADP is not a choice so we don't have to worry about that.
 
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