Defend
Once students have presented a question, the rest of the class may ask questions regarding the answer presented by the student group. This is a chance for groups to challenge one another to provide evidence for their answers, and is an excellent method to reinforce supporting evidence for stated claims.
Once all of the questions have been presented and defended, students should use the POGIL activity as notes for the course. I emphasize to my students that POGILs are excellent study materials to use in preparing for end of unit assessments.