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Given a scientific passage and an answer, generate a question for the given answer.

Passage: A food chain is a simple diagram that shows one way energy flows through an ecosystem. Pictured below is an example of a food chain ( Figure below ). Producers form the base of all food chains. The consumers that eat producers are called primary consumers. The consumers that eat primary consumers are secondary consumers. This chain can continue to multiple levels. Answer: food chain
Output:
What is a diagram that shows a single way that energy flows throughout an ecosystem?