Final answer:
Quitting a group early or a group ending due to a leader's actions exemplarily showcase the influence of group dynamics and the potential negative outcomes of group cohesion like 'groupthink'.
Step-by-step explanation:
Individuals quitting a group early or a group ending due to the actions of a leader are both examples of group dynamics that can lead to the disbanding or failure of a group. These outcomes can be a result of various factors such as the quashing of dissenting opinions within the group, the illusion of unanimity, or the influence of a leader who offers incentives or pushes for actions that may not be in the best interest of the group. Additionally, the phenomenon of 'groupthink,' which prioritizes group cohesion at the expense of critical thinking and can lead to poor decision-making, might also play a role in these situations. Avoiding such outcomes can involve seeking outside opinions, having leaders withhold their positions until all voices are heard, and weighing all available options.