The best evidence that supports the rule that only 10% of energy is transferred from one organism to another is:
There are fewer organisms at the top of the food chain because there is less energy available for life processes.
This statement directly aligns with the concept of energy transfer in an ecosystem, known as the 10% rule, which explains that as energy moves up through the trophic levels—from producers to primary consumers to secondary consumers and so on—only about 10% of the energy is passed on to the next level. The rest is lost through metabolic processes, heat, and waste, which results in fewer organisms being supported at higher trophic levels.