The reason we observe a "pyramid" of energy flow instead of an energy flow "cube" is because the low ecological efficiency of biological systems limits the numbers of organism in the higher trophic levels.

Question

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Energy is lost at each trophic level due to factors like metabolic processes and heat loss, leading to less energy available for higher trophic levels, thus creating a pyramid shape of energy flow rather than a cube.

The Reason We Observe a "Pyramid" of Energy Flow Instead