Lysozyme present in perspiration,saliva,and tears,destroys:

Identify the correct statements from the following:
$(i)$ The skin is the main physical barrier.
$(ii)$ Mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts is a physiological barrier.
$(iii)$ $IgA, IgM, IgE, IgG$ are types of $T$-cells.
$(iv)$ The primary immune response is very intense.

Which cells do not produce antibodies but help $B$-cells in the production of antibodies?

Identify the correct statement$(s)$ regarding the human immune system.

The immunity developed in the body after recovering from a disease is:

Identify the enzyme associated with the production of $B$-lymphocytes and $T$-lymphocytes.