Herbivores: Predators of Vegetation?

Describe the major interactions among organisms in a food web.
Major interactions in food webs are those of omnivores, carnivores, herbivores, etc. each of these consumers is a predator [if you think about herbivores as predictors of vegetation, although vegetation cannot really be preyed upon] and sometimes also prey. The main interactions would be who eats who, and where. Because food webs are so complex and crisscrossed, it is important to understand how major interactions play out, such as the order in which consumers consume or are consumed.