https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:natural-and-artificial-selection/x0c5bb03129646fd6:natural-selection/v/natural-selection-in-peppered-moths 2026-06-30T14:20:41.927190319Z Natural selection in peppered moths Explore natural selection through the example of peppered moth color changes in London. Darker moths became more common during the Industrial Revolution due to pollution, providing better camouflage against predators. Following recent environmental changes, lighter moths are now becoming more common. This case study demonstrates how environmental shifts can influence the how traits can become more common or rare in a species over generations. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/abaf5df1-f439-45a6-927a-1e9fada8ef8a_1280_720_base.png Natural selection in peppered moths Explore natural selection through the example of peppered moth color changes in London. Darker moths became more common during the Industrial Revolution due to pollution, providing better camouflage against predators. Following recent environmental changes, lighter moths are now becoming more common. This case study demonstrates how environmental shifts can influence the how traits can become more common or rare in a species over generations. https://cdn.kastatic.org/ka-youtube-converted/y4BHYYBif3Q.mp4/y4BHYYBif3Q.mp4 197 Natural selection https://www.khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:reproduction-and-selection/xe25057200abc6bd6:natural-selection/a/natural-selection-tx7 2026-06-30T14:20:41.927190319Z Learn and try: Natural selection Learn how natural selection works and how traits become more or less common in a population over many generations. article https://www.khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:reproduction-and-selection/xe25057200abc6bd6:natural-selection/e/understand-natural-selection-tx7 2026-06-30T14:20:41.927190319Z Understand: Natural selection Check your understanding of natural selection in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise https://www.khanacademy.org/science/grade-7-science-tx/xe25057200abc6bd6:reproduction-and-selection/xe25057200abc6bd6:natural-selection/e/apply-natural-selection-tx7 2026-06-30T14:20:41.927190319Z Apply: Natural selection Apply your understanding of natural selection in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise