<P> The largest organisms found on Earth can be determined according to various aspects of an organism's size, such as: mass, volume, area, length, height, or even genome size . Some organisms group together to form a superorganism (such as ants or bees), but such are not classed as single large organisms . The Great Barrier Reef is the world's largest structure composed of living entities, stretching 2,000 km (1,200 mi), but contains many organisms of many types of species . </P> <P> This article lists the largest species for various types of organisms, and mostly considers extant species . The organism sizes listed are frequently considered "outsized" and are not in the normal size range for the respective group . </P>

Which measurement represents the organism that is largest in size
find me the text answering this question