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It's the way God created them to be able to exist in and under water.
they are able ti breathe in water because of the oxygen which is present in water that is H2O
ducks have webbed feet that help them in swimming . fish have gills that help them to breath underwater.their streamlined body allows them to swim fast by reducing resistance due to flowing water.
blowholes is an organ that helps dolphin and whale to breath in water
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