What is the special name of the contraction and expansion movement which pushes the food further in our digestive tract (or alimentary canal) ?

Draw a labelled diagram of the human digestive system. With the help of this diagram, describe the process of digestion of food in man (humans).

Describe one way in which the small intestine is adapted for the absorption of digested food.

Describe the parts of our tooth with the help of a labelled diagram.

What is meant by dental carie ? How are they caused?