Breathing is a reflex reaction you are born with. It is like an instinct to breathe.
without them you wouldn't be able to move around, breathe or even keep your heart pumping.
Swallow
Uh, if you forget to eat or breathe.
all i can say is be yourslef.
Well yes every animal breathe even plants breathe
Yes hens lay eggs without roosters, It follows the same thinking as the fact that mammals ovulate even if there isn't a male present.
No. You are thinking of nitrogen.
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No.
it helps by when you digest somthing it goes through your body and without a digest system you would not be able to eat or even breathe
well, their gills train them to breath without water and live.
Without proper equipment no human can breathe underwater anywhere.