Diastema is associated with

$A$ baby boy aged two years is admitted to play school and undergoes a dental check-up. The dentist observed that the boy had twenty teeth. Which teeth were absent?

What is called the digestive system?

The gastrointestinal functions like secretion and motility are controlled by which system?

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

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.