Sphincter of Oddi is present at:

Select the correct statement$(s)$:
$(A)$ The alimentary canal begins with an anterior opening,the mouth.
$(B)$ Each tooth is embedded in a socket of jaw bone.
$(C)$ Humans exhibit a diphyodont type of dentition.
$(D)$ The oesophagus and the trachea open into the larynx.

The dental formula of human beings is

The primary dentition in human differs from permanent dentition in not having one of the following type of teeth.

How does the primary dentition in humans differ from the permanent dentition,specifically regarding the absence of which type of teeth?

The narrower distal end of the stomach is called: