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Yogita Ingle 7 years, 2 months ago
Just like us, fishes also need oxygen to survive. However, unlike us they do not have lungs. In case of animals (including human beings), lungs extract oxygen from the air we breathe in and supply it to our blood cells. In case of fishes, breathing air is not possible because they are under water. Fishes consume water and this water is expelled through the gills, but not before dissolved oxygen is extracted from it. The gills are specialized organs and are full of blood vessels. As the water is pushed out of fish's body (through gills), the dissolved oxygen mixes with the blood. And that is how fishes manage to get oxygen while living underwater.
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