Which of the following are similarities between B cells and T cells?I) They both recognize antigen using immunoglobulin receptors. II) Both B cells and T cells undergo clonal selection after encountering an antigen. III) B cells and T cells both maintain an immunological memory of previously encountered antigens.

options II and III

Explanation:

Both the T cells and the B cells have to undergo clonal selection which is a process suggested to describe how a one B or T cell that recognizes an antigen which invades the body is selected/picked from the pre-existing cell pool containing varying antigen specificities and then its reproduction to generate a clonal cell population that eliminates the invading antigen.

Both the B and T cells maintain an immunological memory of previously encountered antigens where in on re-exposure to the same antigen quickly initiates the immune response (memory T cell) or proliferates and produces large amounts of specific antibody (memory B cell).

it would be c. xylem.