I instituted homework quizzes on line for the first time this summer. They account for 15% of the final grade. I set a date after which the quiz is closed. My intention is that if a student doesn't submit answers on time, they get a zero. What happens instead is the student gets a "dash mark" which has no impact on the final grade. I realize I can go in and manually put a zero in, but can Canvas automatically enter a zero if the student doesn't submit their answers by the deadline?