https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:explore-biology-through-simulations/x230b3ff252126bb6:phet-simulation-exploring-natural-selection/e/phet-simulation-natural-selection-hs 2026-02-25T20:10:44.456648707Z PhET simulation: Exploring natural selection Use a PhET simulation to test your knowledge of natural selection with this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise