• Food taken by animals contain six classes of nutrients - Carbohydrates, proteins, lipids, vitamins, mineral salta and water.
• Carbohydrates, lipids, proteins and water are essential for the maintenance of life since they provide energy and body building materials. Minerals salta and vitamins keep a person in good health.
• A balanced diet contains all six classes of food and roughage in the right amounts to suit a persons age, sex , activities, weight and the climate.
• Enzymes are proteins that catalyse reactions in living organisms. They are water soluble, substrate specific, sensitive to temperature and pH of the medium, and inactivated by inhibitors.
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