What does $PMNL$ stand for?

When pre-formed antibodies are injected into the body,it is called .........

Which of the following provides passive immunity?

After an organ transplant from an unrelated donor,which of the following plays the lead role in graft rejection?

Arrange the steps of the $phagocytosis$ process in the correct sequence.
$(a)$ Ingestion of microbes by phagocytes
$(b)$ Dilation of blood vessels by histamine
$(c)$ Formation of $phagosome$ and $phagolysosome$
$(d)$ Migration of phagocytes into $E.C.F.$
$(e)$ Attraction of phagocytes by $chemotoxins$ secreted by microbes
$(f)$ Intracellular destruction of bacteria

Which of the following types of immunity does not possess the characteristic of memory?