human digestive system book exercise
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Sir: I am writing to your esteemed self to bring to your notice the nuisance caused by stray dogs in our colony. The number of stray dogs in our colony has risen alarmingly. The rise in their number has led to various other problems such as competition for food and shelter.
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The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion. Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body. The process of digestion has three stages.
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