How do fish take the oxygen out of the water? Matthew of Huntsville, AL
Instead of lungs (which humans have), God gave fish gills (slits on the side of their heads). A fish breathes by opening its mouth and drawing in a mouthful of water. It then forces the water through its gills by pulling in its throat.
A fish's gill has extremely thin membranes, which allow the oxygen from the water to pass through into the blood vessels of the gill. Then, the much-needed oxygen is carried by the blood to other parts of the fish's body.