Which statement is true about subterranean termites?

Subterranean termites are characterized by their elbowed antennae, which is an important morphological feature that helps distinguish them from other types of termites. The elbowed structure of their antennae is a key identification trait and lies within the genetic makeup and evolutionary adaptation of the species. These antennae assist termites in sensing their environment, which is crucial for their survival and social behavior.

The other statements are inaccurate based on the biology of subterranean termites. For instance, straight antennae are more characteristic of certain other termites, and subterranean termites typically do not build nests above ground. Instead, they create extensive underground tunnels and mud tubes that help them access food sources while remaining protected from predators and environmental conditions. Historically, mud tubes serve as protective highways for the termites traveling between their colonies and food sources, making the assertion that they do not create mud tubes incorrect. Understanding these traits is essential for effective termite identification and management in pest control practices.