The De Silva and Anderson (1995) is described that animals can get energy through food to eat, or from the energy stored in the energy body which are not classified as food.
.But the energy will appear in the form of chemical bonding in molecules of nutrients of protein, carbohydrate and fat, etc., which has many kinds of chemical bond and different energy.
.Therefore, each type of animals are capable of using energy obtained from different food. The digestion of animals each different type
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