What is immunity based on?

Which of the following barriers is $NOT$ included in innate immunity?

Identify the correct group of primary lymphoid organs.

Consider the following four statements $(i-iv)$ regarding kidney transplantation and select the two correct ones.
$(i)$ Even if a kidney transplant is successful,the recipient needs to take immunosuppressants for a long time.
$(ii)$ Cell-mediated immune response is responsible for the rejection of the graft.
$(iii)$ $B$-lymphocytes are responsible for the rejection of the graft.
$(iv)$ The acceptance or rejection of a transplanted kidney depends on specific interferons.

Which of the following is a primary lymphoid organ?

Which type of barrier includes the various barriers of innate immunity such as saliva in the mouth and tears from the eyes?