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Respiration in Plants BIOLOGY 263 Notes MODULE - 2 Forms and Functions of 12.1 RESPIRATION Plants and animals Respiration is the stepwise oxidation of complex organic molecules and release of energy as ATP for various cellular metabolic activities. It involves exchange of gases between the organism and the external environment. The green as well as non-green
Burning fossil fuels or wood (all containing carbon) the carbon dioxide is released in the atmosphere. The answer is the natural carbon cycle, in which animals exhale carbon dioxide into the atmosphere and plants then absorb the gas and use it to build their cells, which are of course later consumed by the animals.  In terms of what process releases the most carbon dioxide into our  atmosphere it is decaying organic matter. Total natural decay  accounts for over 80% of all CO2 released annually. Natural  processes in total account for 93% of all CO2 releases.