Lymph tissues are present in which part of the alimentary canal?

The length of the alimentary canal is longer in herbivorous animals than in carnivorous animals because:

The pulp cavity in a tooth is covered by:

Identify the correct statement regarding the human digestive system.

In humans,the Sphincter of Oddi is located in the .......

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