Answer:
The answer is below
Step-by-step explanation:
If your groups members stop working in a project, your progress of working would get slower, as your mind would get lazy, which own't make you work, even if they work was due tomorrow, where as always focus on what you doing. If the people in your members who were working very well, didn't do anything, you group members would loss hope of finishing the tasks, since they don't have a support if they get stuck in a point.
Hope you understand
:-)