How and why is it that fish can breathe underwater and not on land?
In: Biology
Gills are a series of large flat surfaces that the water passes between as it passes what little oxygen is in the water is extracted, in air these structures stick to each other, so that even though air has far more oxygen than water does without the water to separate these “flaps” they cease to function. – https://youtu.be/a7OPV3QZWfs
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