How many main types of immunity are there in the human body?

Which lymphoid organ is shaped like a large bean?

Along with lymphoid organs,$WBCs$ are also present within the mucosa of digestive,respiratory,and excretory tracts as $MALT$,which constitutes about $.......$ of the total lymphoid tissue of the body: (in $\%$)

Which cells are responsible for producing antibodies?

Grafted kidney may be rejected in a patient due to

Which of the following cells are associated with the immune system of the body?