Two questions that have been bugging me

1. When a dog is sniffing very quickly (not from tiredness, just sitting around and sniffing) does he get a better time-resolution on smells? In other words, if he were breathing slowly, would he miss some smells that don’t last very long (for example, if someone who smells interesting walks by quickly)?

2. Why the heck do people (or other mammals, for that matter) have hymens? What kind of evolutionary advantage is that? Is it vestigial in humans, seeing as some women are born without one and there are lots of physical variations?

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