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 2026-04-27T08:40:32.356784737Z Learn: 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/hs-bio/x230b3ff252126bb6:energy-and-matter-in-biological-systems/x230b3ff252126bb6:flow-of-matter-and-energy-through-ecosystems/a/matter-and-energy-in-ecosystems 2026-04-27T08:40:32.356784737Z Learn: 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/bmc-grade-9-science/x345505a97fc4a662:energy-flow-in-an-ecosystem/x345505a97fc4a662:food-chain-and-food-web/v/energy-flow-in-food-chains-webs 2023-09-14T11:22:40.102153098Z Energy flow in food chains & webs Let's explore trophic levels and how energy flows within them. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Energy flow in food chains & webs Let's explore trophic levels and how energy flows within them. https://cdn.kastatic.org/ka-youtube-converted/1z6hrVdDDb4.mp4/1z6hrVdDDb4.mp4 456 Trophic levels and food pyramid 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 2026-04-27T08:40:32.356784737Z 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 2026-04-27T08:40:32.356784737Z 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