https://www.khanacademy.org/science/ap-biology/natural-selection/evidence-for-evolution-ap/v/biogeography-where-life-lives 2025-08-08T21:39:42.49220884Z Biogeography: where life lives Biogeography explores the distribution of plants, animals, and organisms across Earth. New islands form habitats for unique species, like Galapagos finches and Hawaiian honeycreepers. Continental drift explains related species on different continents, with Pangaea's breakup separating organisms. Phylogenetic trees help trace species' movements, revealing Earth's dynamic biodiversity. NOVA video https://cdn.kastatic.org/ka_thumbnails_cache/cc3904f3-87ee-455c-93e9-cf31db72bad6_1280_720_base.png Biogeography: where life lives Biogeography explores the distribution of plants, animals, and organisms across Earth. New islands form habitats for unique species, like Galapagos finches and Hawaiian honeycreepers. Continental drift explains related species on different continents, with Pangaea's breakup separating organisms. Phylogenetic trees help trace species' movements, revealing Earth's dynamic biodiversity. https://cdn.kastatic.org/ka-youtube-converted/2UQC5ts6hUs.mp4/2UQC5ts6hUs.mp4 110 Evidence of evolution https://www.khanacademy.org/science/ap-biology/natural-selection/evidence-for-evolution-ap/e/evidence-of-evolution 2025-12-15T23:10:46.226329631Z Evidence of evolution Test your knowledge on the evidence of evolution! exercise https://www.khanacademy.org/science/ap-biology/natural-selection/evidence-for-evolution-ap/v/molecular-evidence-for-evolutionary-relationships-examples 2023-08-07T17:09:37.131449861Z Molecular evidence for evolutionary relationships examples This investigation focuses on determining the closest plant species to an unknown species by analyzing enzyme presence, amino acid sequence differences, and gel electrophoresis banding patterns. Plant species with the most similarities in these factors are considered closely related. The method also applies to finch species, using molecular evidence to establish evolutionary relationships. Sal Khan video https://cdn.kastatic.org/googleusercontent/TVclrd5j41g1Z7nOof0OvBpBVZM4RJkuJ9VGajdTpHbxmWc7C3rN-rC36Xa1V94JlIR-RssyjcM78d6pHN4c1tyv Molecular evidence for evolutionary relationships examples This investigation focuses on determining the closest plant species to an unknown species by analyzing enzyme presence, amino acid sequence differences, and gel electrophoresis banding patterns. Plant species with the most similarities in these factors are considered closely related. The method also applies to finch species, using molecular evidence to establish evolutionary relationships. https://cdn.kastatic.org/ka-youtube-converted/mHH0sSm2cK8.mp4/mHH0sSm2cK8.mp4 365 Evidence of 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 Evidence of evolution https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:evolution/x0c5bb03129646fd6:evidence-of-evolution-embryology/e/apply-embryology-and-evolution 2026-02-27T12:30:36.531197313Z 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/ap-biology/natural-selection/common-ancestry-and-continuing-evolution/v/evidence-for-evolution 2023-05-19T13:48:00.997234898Z Evidence for evolution Three types of evidence support evolution and natural selection: structural, microbiological, and direct observation. Structural evidence encompasses homologous structures and the fossil record. Microbiological evidence involves DNA similarities and shared processes across species. Direct observation showcases evolution in action, such as antibiotic resistance in bacteria. Sal Khan video https://cdn.kastatic.org/googleusercontent/e5j0jbYx7Y_dfWbxqOlIysYhJd74qz5mlnbAz6m5VgaLw6I48KVsZy2Dfk_BRk3PSwyMaqy4gpkoWCr7w6NL1XUi Evidence for evolution Three types of evidence support evolution and natural selection: structural, microbiological, and direct observation. Structural evidence encompasses homologous structures and the fossil record. Microbiological evidence involves DNA similarities and shared processes across species. Direct observation showcases evolution in action, such as antibiotic resistance in bacteria. https://cdn.kastatic.org/ka-youtube-converted/Q-aGAX27SIo.mp4/Q-aGAX27SIo.mp4 779 Evidence of evolution 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/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-anatomy/v/evidence-of-evolution-anatomy 2022-10-21T22:40:33.613234713Z Evidence of evolution: anatomy Anatomical similarities and differences between various organisms living today and between them and organisms in the fossil record, enable the reconstruction of evolutionary history and the inference of lines of evolutionary descent. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/e4b6f6b9-5452-4cd1-878e-2d45be2edd69_1280_720_base.png Evidence of evolution: anatomy Anatomical similarities and differences between various organisms living today and between them and organisms in the fossil record, enable the reconstruction of evolutionary history and the inference of lines of evolutionary descent. https://cdn.kastatic.org/ka-youtube-converted/J6VJ6dS8D1k.mp4/J6VJ6dS8D1k.mp4 250 Evidence of evolution https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:evolution/x0c5bb03129646fd6:evidence-of-evolution-anatomy/a/evidence-of-evolution-anatomy 2024-08-29T19:13:53.875656978Z Evidence of evolution: anatomy Review your understanding of anatomical evidence of evolution in this free article aligned to NGSS standards. article https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:evolution/x0c5bb03129646fd6:evidence-of-evolution-anatomy/e/understand-anatomical-evidence-of-evolution 2026-03-30T12:24:15.453033844Z Understand: anatomical evidence of evolution Check your understanding of anatomical evidence of evolution in this set of free practice questions aligned to NGSS standards. Megan Cohn exercise https://www.khanacademy.org/science/ap-biology/natural-selection/evidence-for-evolution-ap/v/fossils-rocking-the-earth 2024-05-08T18:05:37.173521444Z Fossils: rocking the Earth Fossils reveal connections between ancient and modern organisms, providing strong evidence for evolution. The fossil record shows gradual evolutionary change, physical proof of extinction, species splitting, and transitional forms. By studying fossils, we can trace the development of features in living organisms and understand how life on Earth has evolved over time. NOVA video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Fossils: rocking the Earth Fossils reveal connections between ancient and modern organisms, providing strong evidence for evolution. The fossil record shows gradual evolutionary change, physical proof of extinction, species splitting, and transitional forms. By studying fossils, we can trace the development of features in living organisms and understand how life on Earth has evolved over time. https://cdn.kastatic.org/ka-youtube-converted/rSWwmN5ozQ0.mp4/rSWwmN5ozQ0.mp4 134 Evidence of evolution https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:evolution/x0c5bb03129646fd6:evidence-of-evolution-anatomy/e/apply-anatomical-evidence-of-evolution 2026-02-27T17:50:36.702607024Z Apply: anatomical evidence of evolution Apply your understanding of anatomical evidence of evolution in this set of free practice questions aligned to NGSS standards. Megan Cohn exercise https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:evolution/x0c5bb03129646fd6:evidence-of-evolution-embryology/a/evidence-of-evolution-embryology 2026-02-27T17:50:36.702607024Z Evidence of evolution: embryology Review your understanding of embryological evidence of evolution in this free article aligned to NGSS standards. article https://www.khanacademy.org/science/ap-biology/natural-selection/population-genetics/v/dna-spells-evolution 2023-07-06T18:19:42.83117487Z DNA spells evolution Genetic mutations lead to variations in traits. These variations can provide survival advantages, resulting in new species over generations. For example, brown bears evolved into polar bears due to beneficial mutations. NOVA video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw DNA spells evolution Genetic mutations lead to variations in traits. These variations can provide survival advantages, resulting in new species over generations. For example, brown bears evolved into polar bears due to beneficial mutations. https://cdn.kastatic.org/ka-youtube-converted/uI_Q1kjmfxo.mp4/uI_Q1kjmfxo.mp4 134 Evidence of evolution https://www.khanacademy.org/science/ap-biology/natural-selection/common-ancestry-and-continuing-evolution/v/cellular-evidence-of-common-ancestry 2023-08-07T17:09:37.131449861Z Cellular evidence of common ancestry All living organisms share a common ancestor, evidenced by cellular similarities like DNA, RNA, and glycolysis. Evolutionary trees depict these relationships, with branches representing different species. Eukaryotes, a distinct group, possess membrane-bound organelles, linear chromosomes, and introns. DNA and RNA sequencing refines our understanding of these connections, enabling more precise evolutionary tree construction. Sal Khan video https://cdn.kastatic.org/googleusercontent/l4TfjlblF6lmVI0eToBTX1Cv-n9sjCYNvbEH7D7GQiD_Bu2r64CqWxjqVnGxH3zzReuJiMuZ4L4-ABAyB8NXiff_ Cellular evidence of common ancestry All living organisms share a common ancestor, evidenced by cellular similarities like DNA, RNA, and glycolysis. Evolutionary trees depict these relationships, with branches representing different species. Eukaryotes, a distinct group, possess membrane-bound organelles, linear chromosomes, and introns. DNA and RNA sequencing refines our understanding of these connections, enabling more precise evolutionary tree construction. https://cdn.kastatic.org/ka-youtube-converted/BwwElHbjTGo.mp4/BwwElHbjTGo.mp4 229 Evidence of evolution