Food chains and food webs are the basis for all life on Earth. Every ecosystem has its own unique organisms and way in which those organisms interact with each other. The way that all food chains work follows the same basic pattern: Producers (usually plants) convert sunlight into food. Primary consumers are the herbivores. Secondary consumers eat the herbivores, while tertiary consumers eat both primary and secondary, and so on. The players differ from habitat to habitat, with different crea...