Final answer:
The law of conservation of energy allows ecosystem ecologists to assert that approximately 10% of energy is transferred from one trophic level to the next.
Step-by-step explanation:
The law of conservation of energy states that energy cannot be created or destroyed, but it can change form. Based on this law, ecosystem ecologists can make the assertion that approximately 10% of energy is transferred from one trophic level to the next. This means that as energy flows through the various levels of a food chain or food web, only a small amount is passed on to the next level.
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