Ants are closely related to termites and are readily distinguished from them by:

Ants are indeed closely related to termites, both belonging to the order Hymenoptera, but they can be distinguished from termites based on specific physical characteristics. The correct choice relates to the shape of the abdomen and the structure of their antennae.

Ants have a distinct constricted waist, which gives their abdomen a characteristic shape that is noticeably narrower at the connection point to the thorax. Additionally, ant antennae are elbowed or bent and consist of 12 segments, while termite antennae are straight and have 13 segments. These anatomical differences are critical for identifying and distinguishing between the two groups.

The other characteristics mentioned—body color, size comparison, and the number of legs—can vary significantly within both ants and termites and may not provide reliable distinguishing features. Thus, focusing on the abdomen shape and the structure of the antennae offers a clear and consistent method for differentiation.