The rumen in cows is a part of the .......

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.

Food is masticated with the help of which part of teeth?

The only human system that is derived from all the three germ layers is

The hepatic portal system extends from where to where?

Diastema is associated with