During development, the formation of the fingers and toes of the fetus requires the removal, by apoptosis, of the tissue between them. List three ways one could determine that this is occurring by apoptosis instead of by necrosis. 2- Discuss two reasons why TH2 cells are inefficient activators of macrophages. 3- Why are naïve CD8+ T cells activated more often by dendritic cells than by other antigen presenting cells?