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Breathers are organisms that possess the ability to inhale oxygen and exhale carbon dioxide in order to facilitate the process of respiration. This process allows them to take in the necessary oxygen required for energy production and remove the waste gas produced by their cells. Breathers can be found in various forms throughout the animal kingdom, ranging from simple single-celled organisms to complex multicellular organisms. The ability to breathe is essential for the survival of these organisms, as it allows them to obtain the oxygen needed to sustain life.