Digestion of food is an important function of the animal body. In animals like lions, cows, humans, etc., the process involves use of various organs starting from the mouth and ending with the anus. The longest part of this canal is known as the ________.

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Step 1: Identify the parts listed — stomach, large intestine, oesophagus, small intestine.

Step 2: Recall typical lengths: the small intestine in an adult is the longest part of the alimentary canal at about $6\ 	ext{m}$ (approximately), the large intestine is about $1.5\ 	ext{m}$, and both the stomach and oesophagus are much shorter (on the order of tens of centimeters).

Step 3: Therefore the longest part of the digestive canal is the small intestine.

FINAL_ANSWER: d

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