Question

In this clip, what evidence is there to suggest that the group has defined roles for the discussion?

Answer 1

As it is not possible to have access to the clip, it will not be possible to promote an answer with exactness, however I will try to help you in the best possible way.

To define discussion roles in a group, we must be able to observe that each person within that group was responsible for a topic, which will be inserted into the discussion, so that each person must assume their role defending the topic to which they were assigned.