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).
When used by the Chinese to protect their land, this section of the wall has had many guards to defend China's capita, Beijing. Made of stone and bricks from the hills, this portion of the Great Wall is 7.8 meters (25.6 ft) high and 5 meters (16.4 ft) wide.
A total of 53 feet of the pedestal is actually below ground to give it a solid footing, and at the very bottom is 91 square feet in area. By contrast, on ground level the base is only 65 square feet in area. The concrete walls above ground range from 8 to 19 feet thick.