Answer:There are several, but the most valuable invention of all time is considered the wheels(or anything that can roll on the ground )
Explanation:The reason for this is because, without wheels none of the other inventions were able to spread fast and it would have been hard to move materials for structures, and mostly wheels made humans able to move from one place to another much faster than without wheels(Ex: car, bus, train, plane, ship), all of the examples need a wheel in some place to build or move