Animals, plants, fungi and bacteria use carbohydrates in varying ways. For plants, carbohydrates form a large part of their structure in the form of cellulose. Animals use carbohydrates primarily for energy, such as starch, glucose and other sugars. Bacteria use carbohydrates for both structure and energy.
The essential amino acid for cats but not dogs is taurine. Taurine is an amino acid that is essential in the process of metabolizing fats. Cats need twelve essential amino acids compared to eleven needed by dogs. The deficiency of this amino acid is most diagnosed in cats ad it generally leads to blindness, deafness and heart failure in felines.
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To bring oxygen in the body because it is a respiratory organ fish