Inhaling air is how you get the oxygen your body needs to turn your food into energy. Other living things use different strategies.
Articles on Gills
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How sharks sleep has been a mystery. Some species of shark need to swim continuously to push water over their gills and breathe. New research is shedding light on how sharks sleep.
Rather than breathing in and out through the mouth, fish use a one-way system, passing water in one direction over their gills.
