https://www.khanacademy.org/science/ap-biology/ecology-ap/energy-flow-through-ecosystems/v/flow-of-energy-and-matter-through-ecosystems 2024-05-08T17:59:40.799210289Z Flow of energy and matter through ecosystems Energy flows and matter recycles in ecosystems, with the Sun as the primary energy source. Plants, as primary producers, convert sunlight into energy-storing biomolecules. Consumers, like animals, obtain energy by eating plants or other animals. Decomposers break down dead organisms, recycling matter and nutrients. Energy is conserved but often released as heat, while matter constantly cycles through the ecosystem. Sal Khan video https://cdn.kastatic.org/googleusercontent/wi_ooqQppefn_o67MB2y0Pgax1p5vKDVr9mj7_kuG6IK5tFwTUetpM1OigZ75_XEnzZhusHhr41EC3CBqHcgm3LPlA Flow of energy and matter through ecosystems Energy flows and matter recycles in ecosystems, with the Sun as the primary energy source. Plants, as primary producers, convert sunlight into energy-storing biomolecules. Consumers, like animals, obtain energy by eating plants or other animals. Decomposers break down dead organisms, recycling matter and nutrients. Energy is conserved but often released as heat, while matter constantly cycles through the ecosystem. https://cdn.kastatic.org/ka-youtube-converted/TitrRpMUt0I.mp4/TitrRpMUt0I.mp4 626 Energy flow in the ecosystem https://www.khanacademy.org/science/grade-8-science-snc-aligned/xa9b0f40dbc1bb08e:ecology/xa9b0f40dbc1bb08e:energy-flow-in-the-ecosystem/a/flow-of-energy-and-cycling-of-matter-in-ecosystems 2021-07-30T23:14:05.129780946Z Flow of energy and cycling of matter in ecosystems Review your understanding of the movement of energy and matter in ecosystems with this free article aligned to NGSS standards. article https://www.khanacademy.org/science/ap-biology/ecology-ap/energy-flow-through-ecosystems/v/impact-of-changes-to-trophic-pyramids 2023-06-22T09:47:49.118446933Z Impact of changes to trophic pyramids The trophic pyramid illustrates energy transfer within ecosystems, highlighting primary producers, consumers, and decomposers. Energy from the sun is stored as biomass, with only 10% transferred between trophic levels. Ecosystem changes, such as reduced sunlight or pesticide use, can impact the entire pyramid, emphasizing the interconnectedness of ecosystems and the importance of energy cycling. video https://cdn.kastatic.org/googleusercontent/QNOnzKHWj3IrO0I5VNGFmUh2T1RSlfAaKiutE7lMm-p2wLIihlbMNdrYOLoiNWI_JfJpm3iUsgEcjZ-f2fvvDNIrEQ Impact of changes to trophic pyramids The trophic pyramid illustrates energy transfer within ecosystems, highlighting primary producers, consumers, and decomposers. Energy from the sun is stored as biomass, with only 10% transferred between trophic levels. Ecosystem changes, such as reduced sunlight or pesticide use, can impact the entire pyramid, emphasizing the interconnectedness of ecosystems and the importance of energy cycling. https://cdn.kastatic.org/ka-youtube-converted/sV-KQ91Fnck.mp4/sV-KQ91Fnck.mp4 432 Energy flow in the ecosystem https://www.khanacademy.org/science/ap-biology/ecology-ap/energy-flow-through-ecosystems/a/food-chains-food-webs 2022-05-13T19:07:50.973158853Z Food chains & food webs How food chains and food webs represent the flow of energy and matter. Trophic levels and efficiency of energy transfer. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:flow-of-matter-and-energy-through-ecosystems/a/matter-and-energy-in-ecosystems 2024-12-04T19:10:32.241162139Z Trophic levels and energy loss Learn about gross and net primary production, trophic efficiency, and how to model energy loss through ecological pyramids. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:flow-of-matter-and-energy-through-ecosystems/e/understand-matter-and-energy-in-ecosystems 2026-04-08T01:15:04.085520103Z Understand: energy and matter in ecosystems Check your understanding about the flow of energy and matter in ecosystems in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:flow-of-matter-and-energy-through-ecosystems/e/apply-matter-and-energy-in-ecosystems 2026-04-01T00:37:12.644935436Z Apply: energy and matter in ecosystems Apply your understanding about the flow of energy and matter in ecosystems in this set of free, standards-aligned practice questions. Wieteke Holthuijzen exercise https://www.khanacademy.org/science/grade-8-science-snc-aligned/xa9b0f40dbc1bb08e:ecology/xa9b0f40dbc1bb08e:energy-flow-in-the-ecosystem/v/energy-flow-in-food-chains-webs-ur 2025-08-08T00:50:08.705567982Z Energy flow in food chains & webs Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Energy flow in food chains & webs Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/2a72xt6_Tnw.mp4/2a72xt6_Tnw.mp4 456 Energy flow in the ecosystem https://www.khanacademy.org/science/how-we-interact-with-our-environment/x049400914d70a1b7:ecosystem/x049400914d70a1b7:energy-flow-through-ecosystems/v/example-identifying-roles-in-a-food-web 2024-05-06T19:22:43.24334365Z Example identifying roles in a food web Energy flows through trophic levels in ecosystems. Grasses, as primary producers, harness sunlight into usable energy. Primary consumers like mice and grasshoppers eat the grass, gaining energy. Secondary consumers, such as hawks, coyotes, vultures, and snakes, eat these primary consumers, continuing the energy transfer Sal Khan video https://cdn.kastatic.org/googleusercontent/6-sRfVIz_ufryrnYoSg7P7CyTgj8caM6_GOgdSvL5gSWcMZm3CJo27yvDf2VWMk0vne6df6-YgcQfyIh2YbGxjuDkA Example identifying roles in a food web Energy flows through trophic levels in ecosystems. Grasses, as primary producers, harness sunlight into usable energy. Primary consumers like mice and grasshoppers eat the grass, gaining energy. Secondary consumers, such as hawks, coyotes, vultures, and snakes, eat these primary consumers, continuing the energy transfer https://cdn.kastatic.org/ka-youtube-converted/xL96QwxwbG0.mp4/xL96QwxwbG0.mp4 132 Energy flow in the ecosystem https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:matter-and-energy-in-ecosystems/x0c5bb03129646fd6:matter-and-energy-in-foodwebs/v/worked-example-analyzing-a-generic-food-web 2026-04-15T10:20:35.936477099Z Worked example: Analyzing a generic food web We can analyze the arrows in a food web to identify producers, primary consumers, secondary consumers, and decomposers. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/4cf6477e-517f-47db-af3e-a2a4863f0445_1280_720_base.png Worked example: Analyzing a generic food web We can analyze the arrows in a food web to identify producers, primary consumers, secondary consumers, and decomposers. https://cdn.kastatic.org/ka-youtube-converted/vniXioPlsLA.mp4/vniXioPlsLA.mp4 244 Energy flow in the ecosystem https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:matter-and-energy-in-ecosystems/x0c5bb03129646fd6:matter-and-energy-in-foodwebs/v/worked-example-analyzing-an-ocean-food-web 2026-04-15T10:20:35.936477099Z Worked example: Analyzing an ocean food web We can analyze the arrows in a food web to identify producers, primary consumers, secondary consumers, and decomposers. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/1dd89016-9d9b-46d0-9daf-48b36919f18d_1280_720_base.png Worked example: Analyzing an ocean food web We can analyze the arrows in a food web to identify producers, primary consumers, secondary consumers, and decomposers. https://cdn.kastatic.org/ka-youtube-converted/vGwhsG-4j-0.mp4/vGwhsG-4j-0.mp4 233 Energy flow in the ecosystem https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:flow-of-matter-and-energy-through-ecosystems/a/producers-and-consumers 2024-06-12T19:16:42.550703216Z Food chains and food webs Learn about the roles of organisms as producers and consumers and how they relate to one another in food chains and food webs. article https://www.khanacademy.org/science/als-k-to-12-science/x46c2fc9f8e023990:2nd-quarter/x46c2fc9f8e023990:illustrating-feeding-relationships-food-chains-and-food-webs/e/food-chains-and-food-webs 2021-04-29T07:51:49Z Food chains and food webs Test your knowledge of food chains and food webs! Ashley exercise https://www.khanacademy.org/science/grade-8-science-snc-aligned/xa9b0f40dbc1bb08e:ecology/xa9b0f40dbc1bb08e:energy-flow-in-the-ecosystem/v/exploring-ecosystems-coastal-food-webs-california-academy-of-sciences 2021-02-05T06:01:09Z Coastal food webs Enter a kelp forest and explore the various threads that connect species together in food webs. How do changes in the ecosystem effect the community?  video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Coastal food webs Enter a kelp forest and explore the various threads that connect species together in food webs. How do changes in the ecosystem effect the community?  https://cdn.kastatic.org/ka-youtube-converted/LVJ5BKcAhAg.mp4/LVJ5BKcAhAg.mp4 255 Energy flow in the ecosystem https://www.khanacademy.org/science/how-we-interact-with-our-environment/x049400914d70a1b7:ecosystem/x049400914d70a1b7:energy-flow-through-ecosystems/e/hs-trophic-levels 2025-01-15T11:43:48.466100598Z Trophic levels Test your knowledge of trophic levels in food chains and food webs! Ashley exercise https://www.khanacademy.org/science/revision-term-2-tg-biology-class-8/x04828215b460a495:week-1/x04828215b460a495:different-ecosystems/e/food-chain-and-webs-in 2026-03-06T17:50:38.494926415Z Food chain and webs Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:energy-flow-in-an-ecosystem/x345505a97fc4a662:food-chain-and-food-web/e/components-of-an-ecosystem 2026-03-06T17:50:38.494926415Z Components of an ecosystem Let's solve some questions! vibhor exercise