Why can't fish live on land?
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Water has oxygen too. Fish get the oxygen their bodies need by pumping water over their gills. That’s why fish keep opening and closing their mouths all the time: they’re breathing. Gills serve the same purpose as our lungs do. Gills extract oxygen from water and send it into the fish’s blood stream. For this reason, most fish, and other aquatic animals that get oxygen from water, can’t survive on land very long.
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