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Respiration characterizes a living organism (human or animal) - there is no live without respiration. We live immersed in gases since the earth is filled with gases. Among all gases in the atmosphere, oxygen gas is inhaled for cellular respiration in animal while plants breath utilizes carbon IV oxide for their usage during respiration. Cellular respiration is the step-by-step process involved in the oxidation of sugars to produce energy. In the ecological system, green plants are the main source of food and energy to animals and some other plants (non-green plants). They manufacture their food by a process called photosynthesis by utilizing energy from external source (the sun). When the food products from these plants are consumed, the essential nutrients are obtained during digestion. The carbohydrate is digested into soluble glucose molecule which then assimilates into the blood stream and is therefore transported into the cells. This is the point where cellular respiration b