Energy flow through trophic levels
Energy flows through an ecosystem in one direction, from producers like plants, to the herbivores that eat them, to the carnivores that eat the herbivores, a sequence called trophic levels. As organisms eat each other, the matter making up their bodies (biomass) transfers along with that energy from one trophic level to the next, though only a fraction of both actually makes it to the next level, since much of it is used up, lost as heat, or given off as waste along the way.
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