Taxonomy is the science of classifying organisms. The system currently used by taxonomists is called the Linnaean taxonomic system, in honor of Swedish biologist Carolus Linnaeus (1707 â 1778). The Linnaean system breaks down organisms into seven major divisions, called taxa (singular: taxon).
Generally speaking, the wall measures about 23 to 26 feet tall. The fracture surface of the wall is ladder type with the base measuring about 7.1 yards wide and the top measuring 6.3 yards wide on average, which makes it firm and very unlikely to collapse.
How long is the Ming Great Wall? - 8,851.8 km (5,500.3 mi) The Ming Great Wall is the best-preserved among all, extending from Hushan in Liaoning to Jiayuguan in Gansu. It includes 6,259.6-kilometer (3,889.5-mile) artificial wall, 359.7-kilometer (223.5-mile) trench and 2,232.5-kilometer (1,387.2-mile) natural barrier.