Answer: Model C(with fishes) demonstrates the cycling of matter and flow of energy among the living and nonliving parts of an ecosystem.
Step-by-step explanation:
It is model C because it includes all the individual elements(fishes, rocks which act as shelter for fishes and plants) to be able to complete the cycle. flow of energy can be examplified by the fishes using plants as sources of energy by eating which they inturn use to swim or it could also be teh otehr way around where as when a fish dies and decomposes that the plants uses teh nutrients to grow. While when looking at the flow of matter it could be exmaplified through the fishes using teh rocks for shelter and also as a place of safety from predators.