This might help,the presence of hydrochloric acid creates an acidic environment within the stomach that is needed to convert pepsinogen to pepsin. Mucus that is produced by the epithelial cells of the stomach help protect the lining of the stomach from the corrosive hydrochloric acid and pepsin.
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B: humans inhale oxygen from plants which is used in cellular respiration to produce water
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because they have nothing wrong wit them
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Progenies of batch I would not be labeled by 35S; progenies of batch II would be labeled by 32P.
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