The correct answer is E. Vegetation types
Step-by-step explanation:
In geography, the zones around the world are classified into five main types: the tropical zone, the Arctic, the Antarctic, the South temperate zone, and the North temperate zone. These zones are determined by two main factors, the first one is the latitude, for example, the tropical zone is near the equator line, and the second one is the vegetation that is different in each zone. For example, the Arctic and Antarctic zones differ from others because the vegetation is not abundant and includes mainly grasses and mosses; on the opposite, in the tropical zone, the vegetation is abundant including diverse grasses, shrubs, and trees. At the same time, it is vegetation the key to determining sub-type zones. Thus, one principal indicator used to delineate the five zones is vegetation types.