It seems like you're looking for options to complete the phrase "A linear pathway showing the flow of energy." Here are a few concepts or phrases that could fit:
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Food chain - A linear pathway showing the flow of energy from producers to various levels of consumers.
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Energy pyramid - A representation of energy flow within an ecosystem, illustrating the decreasing energy available at each trophic level.
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Trophic levels - The various levels in an ecosystem that indicate the flow of energy from one organism to another.
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Ecological succession - A process of change in species structure in a natural community over time which affects the energy flow.
Please select from the options or let me know if you need something more specific!