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1.
A. Dendritic cell ingests foreign antigens and displays antigen fragments on its surface.
Helper T cell (TH) activates B cells, as well as T cells. B cells make antibodies which produce memory cells and destroy pathogen. T cells make cytotoxic T cells which destroy infected cells directly.

2.
A. Cytotoxic T cell — kills infected or abnormal body cells by inducing apoptosis.
B. Helper T cell — activates other immune cells (like B cells and cytotoxic T cells) by releasing cytokines.

3.
B cells protect us by producing antibodies that neutralize pathogens in body fluids (humoral immunity).
T cells protect us by directly killing infected cells (cellular immunity) and by helping coordinate the immune response through signaling.