Responses are to the following: Do you think that modifying the genes of certain crops is... [1 Extremely dangerous for environment], [2 Very dangerous], [3 Somewhat dangerous], [4 Not very dangerous], [5 Not dangerous at all for environment], [6 Can't choose]. Percentages may not add to 100... Categories do not add to total n because "don't know" responses and refusals to respond are not shown. b For science and mathematics education, "low" equates to five or fewer high school and college science or mathematics courses, "middle" is six through eight courses, and "high" means nine