Which of the following is a characteristic of ants?

The correct choice highlights a defining characteristic of ants related to their wing structure. In many ant species, males and females have wings that differ in size and shape, particularly as seen during their nuptial flights when they mate. This period allows for the dispersal and establishment of new colonies. The male ants typically have smaller wings compared to the larger female ants, which can facilitate flight in specific reproductive events.

The other options do not accurately represent the key characteristics of ants. While some insects may have straight antennae or wings of the same size, ants specifically exhibit distinct wing sizes, particularly when observing the differences between males and reproductive females. Additionally, while some ant species may inhabit various environments, not all live specifically in soil, as many build nests in wood, under stones, or in decaying matter. Understanding these characteristics helps in proper identification and management of ant species in pest control contexts.