Explain the process of breathing in fish in 4 lines.

 Most fish exchange gases using gills on either side of the pharynx. Gills consist of threadlike structures called filaments. Each filament contains a capillary network that provides a large surface area for exchanging oxygen and carbon dioxide. Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gills. 

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 Fish execute  the exchange of gases with the help of gills near their eyes.they consist of fibre like structures which act like filtering units.they contain a capplirary system which helps send the nutrients to the body for assimilation i.e.utilisation.they take in water through the mouth and take it to the gills

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Gills in fish help them to use oxygen dissolved in water and thus, helping them in breathing. Gills are well supplied with blood vessels for exchange of gases
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