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  1. Khan Academy | Khan Academy

    Oops. Something went wrong. Please try again. Uh oh, it looks like we ran into an error. You need to refresh. If this problem persists, tell us.

  2. Food chains & food webs (article) | Khan Academy

    A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another. Let's look at the parts of a typical food chain, starting from the bottom—the …

  3. Food chains and food webs (article) | Khan Academy

    Learn about the roles of organisms as producers and consumers and how they relate to one another in food chains and food webs.

  4. Khan Academy

    Khan Academy ... Khan Academy

  5. Impact of changes to trophic pyramids (video) | Khan Academy

    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 …

  6. 可汗学院 | 可汗学院 - Khan Academy

    该页面介绍了食物链和食物网的基本概念。

  7. Matter and energy in food webs (article) | Khan Academy

    Review your understanding of matter and energy in food webs in this free article aligned to NGSS standards.

  8. Food chains & food webs (article) | Ecology | Khan Academy

    A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another. Let's look at the parts of a typical food chain, starting from the bottom—the …

  9. Khan Academy | Khan Academy

    Explore food chains and food webs in high school biology, understanding their importance in ecosystems and the flow of energy through trophic levels.

  10. Flow of energy and matter through ecosystems (video) | Khan Academy

    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, …