There are likely more wheels on Earth than doors. Wheels are a fundamental part of many different types of vehicles, from cars and trucks to bikes and buses. They are also used in a wide variety of machines and equipment, such as tractors, forklifts, and conveyor belts. In contrast, doors are much less common and are primarily found on buildings and vehicles. While it is difficult to say exactly how many of each there are on Earth, it is likely that there are more wheels than doors.
