A forest is a series of layers. The canopy is the topmost layer and made up of the tops of the tallest trees. The understory includes the trees and shrubs between the forest canopy and the ground cover on the forest floor. The understory is limited in size by the amount of sunlight that makes it through the canopy. Would you describe sunlight as a density-dependent or density-independent limiting factor for the understory population? Explain your reasoning.