AP BIOLOGY

Detailed explanation-1: -The liver is an accessory gland that helps in the digestion of food by producing bile, which helps in the digestion of fat in the small intestine but the food does not pass through it, therefore the liver is not a part of the alimentary canal. The stomach, oesophagus and rectum are the parts of the alimentary canal.

Detailed explanation-2: -Alimentary canal is the long digestive tract through which the food travels. This tract extends from the mouth to the anus including the organs such as oesophagus, stomach and the intestines. Liver and Pancreas are parts of the digestive system but does not constitute the alimentary canal.

Detailed explanation-3: -The organs that food and liquids travel through when they are swallowed, digested, absorbed, and leave the body as feces. These organs include the mouth, pharynx (throat), esophagus, stomach, small intestine, large intestine, rectum, and anus.