The correct answer to this question is Oxygen. Like all living creatures, Oxygen is essential for survival. It is what allows us to breathe, through inhaling and exhaling. Catfish, who are aquatic animals, breathe it differently. They breathe it through the water. Catfish and all other fish use their gills for breathing Oxygen. Catfish are ray-finned fish.
They are called catfish because they have cat whiskers. Catfish can be of different sizes and also behave differently. They are apart of the kingdom Animalia and the class Actinopterygii. Catfish have several different purposes, including helping farmers and used for human consumption.
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