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The image shows two pages of an open textbook. The left page has headings such as "secretion of saliva", "functions of saliva", "chemical digestion of polysaccharides", "lubrication of food", "cleansing and lubricating", "non-specific defence", and "taste". The right page has headings such as "PHARYNX", "Learning outcomes", "Blood supply", "Nerve supply", and "OESOPHAGUS". The text discusses biological functions and anatomy. There is no information in the image that relates to Jalingo, Nigeria.
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