Fish
By using gills
Best Regards M. A. A. Al- Fatlawi
Fish take oxygen from atmosphere by jumping in water
Gills extract the oxygen, put carbon dioxide into the water, and it is exhaled out through the gills.
Fishes use a combination of the mouth (buccal cavity) and the gill covers and openings (opercula).
Read more details about mechanism for oxygen intake in the following link.
https://www.petmd.com/fish/care/evr_fi_fish_respiration
https://338373gasexchange.weebly.com/fish.html
I completely agree with Dr. Osama , the fish obtain oxygen by using gill.
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