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Animals are almost the same as human in energy transformations. They change food into thermal and mechanical energy. Due to this constant temperature is maintained in a body and animals are able to move.
Animals need oxygen. âYou cannot evolve animals like us without having a significant amount of oxygen,â says geochemist Dick Holland of Harvard University. âWithout the Great Oxidation Event [a dramatic rise of oxygen in Earthâs atmosphere some 2.3 billion years ago], we would not be here.