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.
After a full investigation, on, April 18th, 2009, it was announced that the length of the Great Wall of Ming Dynasty was 8,851.8 km (5,500miles). The wall extends from Hushan Great wall in Liaoning Province to the Jayuguan Pass in Gansu Province. The section of Great Wall in Beijing is about 550km long.