Ecologists use models to illustrate the cycling of matter and flow of energy within an ecosystem. Which of the claims below does this model support? Select all the claims that are supported. A. The number of trophic levels is unlimited. B. The number of trophic levels is limited, and typically is less than 10. C. On average, about 10 percent of available energy is transferred from one trophic level to the next. D. Among consumers in an ecosystem, first-level consumers have the most available energy. E. The maximum amount of energy in a trophic level is 10,000 Joules.