sentence2_structure: Pyramid ecosystem<>is used<>to show energy flow through the trophic levels$$$Pyramid ecosystem<>to show<>energy flow
sentence1: 5. Explain how energy flows through ecosystems and why the energy transfer at each trophic level results in a loss of energy.
sentence2: Pyramid ecosystem is used to show energy flow through the trophic levels.
question: What is used to show energy flow through the trophic levels?