https://www.khanacademy.org/science/ap-biology/natural-selection/natural-selection-ap/v/introduction-to-evolution-and-natural-selection 2024-05-06T19:22:43.24334365Z Introduction to evolution and natural selection Natural selection is a mechanism of evolution and explains how species adapt to their environment over time through variations in traits. Examples include the peppered moth adapting to industrial pollution, yearly flu virus changes, and antibiotic-resistant bacteria. Understanding natural selection is essential for studying living systems. Sal Khan video https://cdn.kastatic.org/googleusercontent/t55LO6_r6qTqM1BV6MfZo9h5rMzP12VWMnPrKSmkzGH5D2aO2gWmJ6qYIn5haLm4ZhtU9vn_hU6ZNSiUskhxHoU Introduction to evolution and natural selection Natural selection is a mechanism of evolution and explains how species adapt to their environment over time through variations in traits. Examples include the peppered moth adapting to industrial pollution, yearly flu virus changes, and antibiotic-resistant bacteria. Understanding natural selection is essential for studying living systems. https://cdn.kastatic.org/ka-youtube-converted/GcjgWov7mTM.mp4/GcjgWov7mTM.mp4 1059 Evolution https://www.khanacademy.org/science/shs-biology-2/x2ea931c66bba6acd:3rd-quarter/x2ea931c66bba6acd:lesson-2-evolution-and-origin-of-biodiversity/v/genetic-drift 2020-09-09T11:53:27Z Genetic drift Let's explore the concept of genetic drift. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/W6uPy9kd_9o51jbVs5xruB0nI8ISBF6wUwZPeqj7kXpUp_03H30EpUWJ_vFWuaY9esbyiC-xjUZ1IzVLEFR8CBlX Genetic drift Let's explore the concept of genetic drift. https://cdn.kastatic.org/ka-youtube-converted/fA0rfs9t5mY.mp4/fA0rfs9t5mY.mp4 490 Evolution https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:natural-and-artificial-selection/x0c5bb03129646fd6:adaptation-and-environmental-change/a/phet-simulation-article-exploring-natural-selection 2026-02-27T18:10:31.250004438Z PhET simulation: Explore natural selection Learn about natural selection using an interactive PhET simulation. article https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:natural-and-artificial-selection/x0c5bb03129646fd6:natural-selection/e/understand-natural-selection-ms 2026-04-27T08:10:46.028809868Z 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/ka-biology-grade-12/x406cf103e0507862:in-in-evolution/x406cf103e0507862:in-in-evolution-and-natural-selection/e/hs-evolution-and-natural-selection 2026-05-01T16:30:39.134904484Z Evolution and natural selection Test your knowledge of evolution and natural selection! Ashley exercise https://www.khanacademy.org/science/in-in-class-10-biology/in-in-heredity-and-evolution/x34856011f50c37d5:evolution/e/in-in-natural-selection-and-genetic-drift 2021-04-29T07:50:48Z Natural Selection and Genetic drift This exercise provides practice for concepts of evolution through natural selection and genetic drift. saiyem exercise https://www.khanacademy.org/science/in-in-class-10-biology/in-in-heredity-and-evolution/x34856011f50c37d5:evolution/v/acquired-vs-inherited-traits-heredity-evolution-biology-khan-academy 2020-09-09T11:53:28Z Acquired vs inherited traits Let's see if acquired traits can be inherited. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/4i8umlqaWaJiNWZSZH8UH1hQo0wfKzVPbeTdec0AdZg3CXjXL8knI2taC-7aGaaFduC3sDOWqcNGq90v8zSzFcs Acquired vs inherited traits Let's see if acquired traits can be inherited. https://cdn.kastatic.org/ka-youtube-converted/XyFgP3Hze4Q.mp4/XyFgP3Hze4Q.mp4 605 Evolution https://www.khanacademy.org/science/shs-biology-2/x2ea931c66bba6acd:3rd-quarter/x2ea931c66bba6acd:lesson-2-evolution-and-origin-of-biodiversity/a/charles-darwins-evidence-for-evolution 2025-04-10T15:57:44.435689794Z Charles Darwin's evidence for evolution article https://www.khanacademy.org/science/ap-biology/natural-selection/natural-selection-ap/a/darwin-evolution-natural-selection 2026-04-30T05:40:35.129589872Z Learn: 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/ka-biology-grade-12/x406cf103e0507862:in-in-evolution/x406cf103e0507862:in-in-evolution-and-natural-selection/e/natural-selection-and-darwin 2021-04-29T07:51:05Z Natural selection and Darwin Test your knowledge on natural selection and Charles Darwin! Ashley exercise https://www.khanacademy.org/science/telangana-class-10-biologyin/x58e314ef7f27e124:heredity-and-evolution/x58e314ef7f27e124:evolution/v/speciation-with-example-pk 2025-12-18T03:40:48.390254156Z Speciation (with example) Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Speciation (with example) Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/2xIgC7C5-ZM.mp4/2xIgC7C5-ZM.mp4 846 Evolution https://www.khanacademy.org/science/ap-biology/natural-selection/speciation/e/speciation 2021-04-29T07:49:55Z Speciation Test your knowledge of speciation! exercise https://www.khanacademy.org/science/biology/her/x324d1dcc:more-about-natural-selection/a/lines-of-evidence-for-evolution 2024-05-29T17:16:29.06533157Z Evidence for evolution Evidence for evolution: anatomy, molecular biology, biogeography, fossils, & direct observation. article https://www.khanacademy.org/science/shs-biology-2/x2ea931c66bba6acd:3rd-quarter/x2ea931c66bba6acd:lesson-6-evidences-of-evolution/v/homologous-analogous-structures-heredity-evolution-biology-khan-academy 2020-09-09T11:53:26Z Homologous & analogous structures Let's explore what homologous & analogous structures are Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZcgWild9HD0sieXZP67zIkzlsWg0-TrI_iSyV95Od-9-h9Sx1YkJme_kBtGgalorOZ2HoyseXOeDMNElPBubs-QM Homologous & analogous structures Let's explore what homologous & analogous structures are https://cdn.kastatic.org/ka-youtube-converted/m0_W3xXIgDE.mp4/m0_W3xXIgDE.mp4 759 Evolution https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:evolution/x0c5bb03129646fd6:evidence-of-evolution-embryology/v/evidence-of-evolution-embryology 2022-10-21T22:40:33.613234713Z Evidence of evolution: embryology Comparison of the embryological development of different species reveals similarities that show relationships not evident in the fully-formed anatomy. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/06578006-645c-486a-b294-e51329986ceb_1280_720_base.png Evidence of evolution: embryology Comparison of the embryological development of different species reveals similarities that show relationships not evident in the fully-formed anatomy. https://cdn.kastatic.org/ka-youtube-converted/3444TjgJ8ro.mp4/3444TjgJ8ro.mp4 180 Evolution https://www.khanacademy.org/science/10th-grade-melcs/x1cfbe2e54160ac98:3rd-quarter/x1cfbe2e54160ac98:biodiversity-and-evolution/v/fossils-their-formation-heredity-evolution-biology-khan-academy 2020-09-09T11:53:30Z Fossil & their formation Let's explore fossils and their formation. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/8uHWxghtuAAnS7UEyIacmbHb_V1ZUbw4GfNVBfjmvCNwdXYLNpKAGWaDenJLCWEII7SuVPTFdaQwn56yjM5h1tGb8Q Fossil & their formation Let's explore fossils and their formation. https://cdn.kastatic.org/ka-youtube-converted/ZU9w6HUvZKg.mp4/ZU9w6HUvZKg.mp4 596 Evolution https://www.khanacademy.org/science/shs-biology-2/x2ea931c66bba6acd:3rd-quarter/x2ea931c66bba6acd:lesson-6-evidences-of-evolution/e/in-in-homologous-and-analogous-characteristics 2024-05-07T06:20:54.064571454Z Homologous and Analogous characteristics This exercise provides practice for CBSE class X level concepts of homologous and analogous characteristics. saiyem exercise https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:evolution/x0c5bb03129646fd6:evidence-of-evolution-embryology/e/apply-embryology-and-evolution 2026-04-28T03:50:32.704831424Z Apply: Embryology and evolution Apply your understanding of embryology and evolution in this set of free practice questions aligned to NGSS standards. Megan Cohn exercise https://www.khanacademy.org/science/shs-biology-2/x2ea931c66bba6acd:3rd-quarter/x2ea931c66bba6acd:lesson-6-evidences-of-evolution/e/evidence-for-evolution 2021-04-29T08:01:36Z Evidence for evolution Test your knowledge on the evidence for evolution! Ashley exercise https://www.khanacademy.org/science/biology/history-of-life-on-earth/the-diversification-of-life/v/human-evolution-overview 2024-05-06T19:22:43.24334365Z Human evolution overview The extinction of dinosaurs 65 million years ago paved the way for a rodent-like creature to evolve into various species. This creature survived the mass extinction event and gradually evolved into primates, monkeys, apes, and us—Homo sapiens. Sal Khan video https://cdn.kastatic.org/googleusercontent/M106-fbXh-CJkjAhak--b2GKANap-cl8RrTFAIksCg-mvGwMqxLstjMEP1pXbEjALa8aok-rQOtFyPrPcr7F96dNpA Human evolution overview The extinction of dinosaurs 65 million years ago paved the way for a rodent-like creature to evolve into various species. This creature survived the mass extinction event and gradually evolved into primates, monkeys, apes, and us—Homo sapiens. https://cdn.kastatic.org/ka-youtube-converted/frE1rjhH77Y.mp4/frE1rjhH77Y.mp4 746 Evolution https://www.khanacademy.org/science/telangana-class-10-biologyin/x58e314ef7f27e124:heredity-and-evolution/x58e314ef7f27e124:evolution/e/human-evolution 2026-05-01T16:30:39.134904484Z Human evolution This exercise traces the history of human evolution, outlining the timeline from early Homo species to modern humans. It examines fossil and genetic evidence supporting the Out of Africa origin and global migration patterns. It also clarifies the biological reality that all humans belong to one species, with physical differences reflecting minor adaptations rather than separate races. Khan Academy exercise