Bulk of the tooth in mammals is made up of

The pulp cavity of a tooth contains:

In the human dental formula,the numbers in the numerator indicate . . . . . . .

Identify the correct statement with reference to the human digestive system.

Aggregates of lymphoid tissue present in the distal portion of the small intestine are known as

$A-$ The permanent teeth begin to replace the temporary ones at about the age of six years.
$R-$ This type of dentition is called diphyodont.