https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:matter-and-energy-in-ecosystems/x0c5bb03129646fd6:matter-and-energy-in-foodwebs/v/matter-and-energy-in-food-webs-ms 2022-09-02T08:54:53.447432795Z Matter and energy in food webs Food webs are models that demonstrate how matter and energy is transferred between producers, consumers, and decomposers as the three groups interact within an ecosystem. Transfers of matter into and out of the physical environment occur at every level. Decomposers recycle nutrients from dead plant or animal matter back to the soil in terrestrial environments or to the water in aquatic environments. The atoms that make up the organisms in an ecosystem are cycled repeatedly between the living and nonliving parts of the ecosystem. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/1d6d8d90-7d8c-4cec-9a89-bf656d3bae83_1280_720_base.png Matter and energy in food webs Food webs are models that demonstrate how matter and energy is transferred between producers, consumers, and decomposers as the three groups interact within an ecosystem. Transfers of matter into and out of the physical environment occur at every level. Decomposers recycle nutrients from dead plant or animal matter back to the soil in terrestrial environments or to the water in aquatic environments. The atoms that make up the organisms in an ecosystem are cycled repeatedly between the living and nonliving parts of the ecosystem. https://cdn.kastatic.org/ka-youtube-converted/qIgL05zOx5U.mp4/qIgL05zOx5U.mp4 251 Food webs and ecosystems 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 Food webs and ecosystems 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 Food webs and ecosystems https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:matter-and-energy-in-ecosystems/x0c5bb03129646fd6:matter-and-energy-in-foodwebs/a/matter-and-energy-in-food-webs 2026-06-30T14:20:41.927190319Z Key points: Matter and energy in food webs Review your understanding of matter and energy in food webs in this free article. article https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:matter-and-energy-in-ecosystems/x0c5bb03129646fd6:matter-and-energy-in-foodwebs/e/understand-matter-and-energy-in-food-webs 2026-06-30T14:20:41.927190319Z Understand: Matter and energy in food webs Check your understanding of matter and energy in food webs in this set of free, standards-aligned practice questions. Khan Academy exercise https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:matter-and-energy-in-ecosystems/x0c5bb03129646fd6:matter-and-energy-in-foodwebs/e/apply-matter-and-energy-in-food-webs 2026-06-30T14:20:41.927190319Z Apply: Matter and energy in food webs Apply your understanding of matter and energy in food webs in this set of free, standards-aligned practice questions. Khan Academy exercise