A)redness.
B)swelling.
C)pain.
D)lower temperature.

A)all B cells are exact clones of each other.
B)all T cells are exact clones of each other.
C)when a B or T cell is stimulated by encountering the correct antigen,it divides to form a clone of cells that will respond to the same antigen.
D)when a B or T cell is stimulated by encountering the correct antibody,it divides to form a clone of cells that will respond to the same antibody.

A)Complement is a complex of plasma proteins that are activated in the presence of pathogens.
B)Complement is required for formation of antigen-antibody complexes.
C)Complement forms holes in bacterial membranes and allows fluid and salts to enter a bacterial cell.
D)Complement attracts phagocytes to the bacterial cell and increases its likelihood of being engulfed.