© 2017 D. Fiedler et al. CBE—Life Sciences Education © 2017 The American Society for Cell Biology. This article is distributed by The American Society for Cell Biology under license from the author(s). It is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0).

This study is part of the Swedish–German cooperation project “EvoVis: Challenging Threshold Concepts in Life Science—enhancing understanding of evolution by visualization,” funded by the Swedish Research Council (VR 2012:5344, LT). We thank the whole EvoVis group and Dr. Jörg Großschedl and Charlotte Neubrand for helpful discussions that contributed to this study. Special thanks to Dr John Blackwell for the language review and valuable and insightful comments on evolution aspects of the paper. We are also very thankful to the students who participated in this study and the experts for their comments on the instruments.

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