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Transcript of Lesson 22
Energy Flow in Ecosystems
Energy flows through an ecosystem in a one-way stream, from primary producers to various consumers.
A food chain is a series of steps in which organisms transfer energy by eating and being eaten.
A food web shows all the possible feeding relationships at each level in a community.
The decomposition process releases nutrients that can be used by primary producers.
They break down dead and decaying matter into forms that can be reused by organisms, similar to the way a recycling center works.
Each step in a food chain or food web is called a trophic level.
Pyramids of energy show the relative amount of energy available at each trophic level.
The total amount of living tissue within a given trophic level is called its biomass.
A pyramid of numbers shows the relative number of individual organisms at each trophic level in an ecosystem.