Food Chain: is a series of organisms within an ecosystem in which each organism feeds on the one before it and fed by the other after it. Food Web: is a network of food chains which are interconnected at various trophic levels. Correct Answer Food Chain: is a series of organisms within an ecosystem in which each organism feeds on the one before it and fed by the other after it. Food Web: is a network of food chains which are interconnected at various trophic levels.