Fig. 3
From: Freshman Undergraduate Biology Students’ Difficulties with the Concept of Common Ancestry
Students’ responses to version E of the survey. Question designations refer to the designations in Table 2. The vertical bars indicate the fraction of student responses at each level for each question: level 1 (“No”) at the bottom, level 2 (“Not Sure”), level 3 (“Yes”) at the top. The stepped diagonal lines indicate the predicted breakpoints between each of the levels for each question produced by the POLR model