Final answer:
Georg Simmel highlighted the fragility of dyads, as these two-member groups cease to exist if one person withdraws, underscoring their dependence on both members.
Step-by-step explanation:
One of the group dynamics that Georg Simmel argued commonly occurs within dyads is their inherent fragility and dependence on both members for the group's continuation. In a dyad, which is a two-member group, if one person withdraws, the group dissolves. This is in contrast to a triad, where the group can survive even if one member leaves. A key characteristic of dyads noted by Simmel is the intense and direct personal relationship that exists due to its members being solely reliant on one another to maintain the group entity. Hence, the dynamic is straightforward and the connection is very personal and intense.