Energy Availability: There is more total energy available at the herbivore level (primary consumers) than at the carnivore level (secondary/tertiary consumers).

Transfer Efficiency: Herbivores generally exhibit a higher ecological efficiency (the ratio of energy available to the next level) compared to carnivores. Carnivores at higher levels must expend more energy to find and catch prey, and they are further from the primary energy source (the sun), making the overall energy transfer less efficient as the pyramid narrows toward the top.

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