Termites are social insects that live in large, often elaborately constructed nests. A. Although termites resemble ants in terms of size, metarmorphosis, and social organization, they actually belong to a different order of insects. B. Some termites build their nests under ground, while other construct above-ground structures with thick, insulating wall. C. Some termite species grow a fungus in their nests so that it will purify the air by taking in carbon dioxide and giving off oxygen. D. Termites are sensitive to dryness and to changes in temperature, so their nests are designed to minimize these factors. E. Whether they lie above ground or below ground, termite nests must include special pores that allow air to enter the nests. F. The nests of Macroternes natalensis consist of a series of chambers and tunnels that allow for the circulation of air and the exchange of oxygen and carbon dioxide.