Final answer:
The biogeochemical cycle is both a link and a set of activities that facilitate the flow of information and materials.
Step-by-step explanation:
The correct answer to the question is the biogeochemical cycle. The biogeochemical cycle involves interconnected pathways through which water or a chemical element such as carbon or nitrogen is continuously recycled through the biotic and abiotic components of ecosystems. It facilitates the flow of information and materials between the different components of the ecosystem.