To explain: The problems would be faced by terrestrial animals having gills instead of lungs.
Introduction: The process of gas exchange occurs between an organism and its environment is known as respiration. For cellular respiration, most of the animal cells need a continuous oxygen supply. During respiration, oxygen is inhaled from the environment by animal and transport to individual cells of the body. As well as, carbon dioxide produced by the cell during cellular respiration is exhaled from the body to the atmosphere.
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