Answer the following question: I read this background article the other day: A mycorrhiza (Greek for "fungus roots") is a symbiotic association between a fungus and the roots of a plant. In a mycorrhizal association, the fungus may colonize the roots of a host plant by either growing directly into the root cells, or by growing around the root cells. This association provides the fungus with relatively constant and direct access to glucose, which the plant produces by photosynthesis. The mycelia of the fungi increase the surface area of the plant’s root system. The larger surface area improves water and mineral nutrient absorption from the soil.  I am facing a new situation today: Two friends studied permaculture together. Bill studied about mycorrhiza, while Red studied about hugel kultur.  Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which friend learned less about surface areas of root systems?
Answer:
Red