https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:mechanisms-of-evolution-hs/x230b3ff252126bb6:natural-selection-and-adaptation/v/natural-selection-and-adaptation 2022-09-24T04:45:13.131282509Z Natural selection and adaptation Natural selection leads to adaptation, that is, to a population dominated by organisms that are anatomically, behaviorally, and physiologically well suited to survive and reproduce in a specific environment. That is, the differential survival and reproduction of organisms in a population that have an advantageous heritable trait leads to an increase in the proportion of individuals in future generations that have the trait and to a decrease in the proportion of individuals that do not. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/9da3549e-692d-413f-876e-4ea63c7c0a12_1280_720_base.png Natural selection and adaptation Natural selection leads to adaptation, that is, to a population dominated by organisms that are anatomically, behaviorally, and physiologically well suited to survive and reproduce in a specific environment. That is, the differential survival and reproduction of organisms in a population that have an advantageous heritable trait leads to an increase in the proportion of individuals in future generations that have the trait and to a decrease in the proportion of individuals that do not. https://cdn.kastatic.org/ka-youtube-converted/giw2ELZr-bE.mp4/giw2ELZr-bE.mp4 532 The scientific theory of natural selection https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:natural-and-artificial-selection/x0c5bb03129646fd6:adaptation-and-environmental-change/a/adaptation-and-environmental-change 2026-02-27T17:50:36.702607024Z Adaptation and environmental change Review your understanding of adaptation and environmental change in this free article aligned to NGSS standards. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:mechanisms-of-evolution-hs/x230b3ff252126bb6:natural-selection-and-adaptation/e/understand-natural-selection-and-adaptation 2026-04-02T04:18:15.637466676Z Understand: natural selection and adaptation Check your understanding of natural selection and adaptation in this set of free, standards-aligned practice questions. exercise https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:the-living-world-ecosystems-and-biodiversity/x0b0e430a38ebd23f:changes-to-ecosystems/v/environmental-change-and-adaptation-in-galapagos-finches 2024-01-04T21:34:20.525650636Z Environmental change and adaptation in Galápagos finches Adaptation by natural selection is one important process by which species change over time. After an environmental change, traits that support successful survival and reproduction in the new environment become more common; those that do not become less common. Thus, the distribution of traits in a population changes. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/dfae6055-fa13-4855-818a-9329093bd5c9_1280_720_base.png Environmental change and adaptation in Galápagos finches Adaptation by natural selection is one important process by which species change over time. After an environmental change, traits that support successful survival and reproduction in the new environment become more common; those that do not become less common. Thus, the distribution of traits in a population changes. https://cdn.kastatic.org/ka-youtube-converted/0G2uDKYBX-c.mp4/0G2uDKYBX-c.mp4 141 The scientific theory of natural selection https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:natural-and-artificial-selection/x0c5bb03129646fd6:natural-selection/v/natural-selection-in-peppered-moths 2025-08-26T23:00:40.300039358Z Natural selection in peppered moths The video discusses natural selection, illustrated by the peppered moth's color changes in London. Darker moths became predominant during the Industrial Revolution due to pollution, providing better camouflage against predators. With recent environmental improvements, lighter moths are reemerging. This demonstrates how environmental shifts can influence the prevalence of certain traits in a species over time. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/abaf5df1-f439-45a6-927a-1e9fada8ef8a_1280_720_base.png Natural selection in peppered moths The video discusses natural selection, illustrated by the peppered moth's color changes in London. Darker moths became predominant during the Industrial Revolution due to pollution, providing better camouflage against predators. With recent environmental improvements, lighter moths are reemerging. This demonstrates how environmental shifts can influence the prevalence of certain traits in a species over time. https://cdn.kastatic.org/ka-youtube-converted/y4BHYYBif3Q.mp4/y4BHYYBif3Q.mp4 197 The scientific theory of natural selection https://www.khanacademy.org/science/ap-biology/natural-selection/natural-selection-ap/a/darwin-evolution-natural-selection 2024-08-14T09:18:23.232272817Z Darwin, evolution, & natural selection Learn about Charles Darwin's voyage on the HMS Beagle and his ideas about evolution and natural selection. article https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:natural-and-artificial-selection/x0c5bb03129646fd6:natural-selection/a/natural-selection 2026-04-15T10:20:35.936477099Z Key points: Natural selection Review your understanding of natural selection in this free article. article https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:natural-and-artificial-selection/x0c5bb03129646fd6:natural-selection/e/understand-natural-selection-ms 2025-07-01T21:05:20.470958635Z Understand: natural selection Check your understanding of natural selection in this set of free, standards-aligned practice questions. Megan Cohn exercise https://www.khanacademy.org/science/ap-biology/natural-selection/natural-selection-ap/e/natural-selection 2023-08-07T17:09:37.131449861Z Natural selection Test your knowledge of natural selection! Megan Cohn exercise