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 large slab for a building foundation may be 60 feet long, 40 feet wide, and have a thickness of 6 inches. The area of the slab is 60 feet x 40 feet = 2,400 square feet. Converting the thickness measurement to 0.5 feet and multiplying the area by this yields a volume of 1,200 cubic feet.