Read the passage. During the first week of the group project, everyone assumed someone else was taking notes. Two students researched the same question, and no one prepared the chart for the presentation. The group paused to assign roles: evidence finder, note keeper, slide designer, and discussion leader. They also spent five minutes at the end of each meeting naming what was finished and what was next. The project improved when cooperation became visible and specific. The students learned that teamwork is not just being friendly. It requires shared structures that help people depend on one another. Which choice gives the best central idea for the selection about team project roles?