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Substances that allow heat to pass through them are called conductors. Metals like silver, copper, iron, aluminium etc. are good conductors of heat.
Infection due to bacteria and virus, food that is not digested by the body, diseases of intestine etc. are the causes of diarrhoea.
The food forms a bolus in the mouth after mixing with saliva. The bolus is passed into the stomach through a long muscular pipe called oesophagus.