Thymus is the site for the development and maturation of
$T-lymphocyte$
$B-lymphocyte$
$Both$ $(a)$ $and$ $(b)$
$ntibodies$
Which of the following is not the main function of lymph glands
Immune activities defence mechanism for different diseases is known as
What are pathogens ?
What is Active immunity and Passive immunity ?
‘Second line of defence' is known as