(1)the human nose is an underestimated tool. humans are often thought to be __1_insensitive__ smellers compared with animals, but this is largely because, unlike animals, we stand upright. this means that our noses are __2__ to detecting those smells which float through the air, __3_missing__ the majority of smells which stick to surfaces. in fact though, we are extremely sensitive to smells, even if we do not generally realize it. our noses are capable of __4_detecting__ human smells even when these are __5_reduced__ to far below one part in one million.
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