What are two types of lymphocytes?

What is the site of differentation of two types of lymphocytes?

Give the common site of formation of two types of lymphocytes.

Which two types of lymphocytes are involved in immunity ?

Name three types of T-lymphocytes.

Describe three types of T-lymphocytes and give their functions.

Name the two special types of lymphocytes in humans. How do they differ in their roles in immune response?

What are weeds ? What are the two types of weeds ?

What are the two types of cells on the basis of nature of nucleus ?