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Milk is a complex biological fluid produced by the mammary glands of mammals and is considered one of the most nutritious natural foods. The physico-chemical properties of milk refer to its physical and chemical characteristics that determine its composition, behavior during processing, and overall quality. These properties include color and appearance, density, viscosity, acidity and pH, surface tension, freezing point, boiling point, and chemical composition such as fat, protein, lactose, minerals, and water. One of the important physical properties of milk is its color and appearance. Normal milk has a slightly yellowish-white color due to the _____ _________ _______ ______ _________ _______ __________ _____.
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