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A fish takes the water in through his mouth continually, and it runs over his gills, and out behind through his gill-covers. So the gills suck-up the air out of the water, and send it into the fish's blood, just as they do in the newt-larva. Yes, I know. But the whale breathes with lungs like you and me; and when he goes under water he has to hold his breath, as you and I have.
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