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Smell is often said to be our most (i)_____ sense, but I am not sure that the evidence really supports that conclusion. Certainly it is (ii)______ to suggest that primeval organisms learned to discern nice and noxious chemicals before they learned to detect light and sound. Yet there is good evidence to suggest that the smell system we have now is actually (iii)_____ than our visual system and possibly our hearing system as well.
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