Fig. 2
From: Iterative design of a simulation-based module for teaching evolution by natural selection
Two LabLibs questions in Sect. 4 of the Darwinian Snails tutorial version that ask student to predict results (a) and then reflect on an experiment about the role of mutations in evolution (b). In between these two questions, students run a simulation to observe the directionality of mutations in the presence of crabs. Each question is shown to students as a fill-in-the-blank sentence, where blanks are filled in from choices in drop-down menus. The figure shows all choices available from each menu. These two questions were added after Study 1 and before Study 2