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In this life science and engineering unit, students explore the important role bees play as pollinators within ecosystems. Students investigate the impact of human activities on wild bee species and discover why a reduction in biodiversity threatens global food security. Confronted with this problem, students make a choice: save the bees or replace them. The unit earned a rating of High Quality NGSS Design if Improved by the NextGenScience cadre of expert reviewers. See the freely available Stile unit and corresponding EQuIP Rubric for Science evaluation report here.