Which characteristic is true for crustaceans?

Crustaceans are a diverse group of arthropods that typically exhibit characteristics such as having at least five pairs of legs, which is prominently seen in species like crabs and lobsters. These legs are adapted for various functions such as locomotion and handling food. Additionally, crustaceans breathe using gills, which facilitate gas exchange in aquatic environments. This combination of having multiple pairs of legs and gills is fundamental to their biology and helps define them as a class within the larger phylum of arthropods.

The other options do not accurately describe crustaceans as a whole. While some crustaceans are found on land, they are not exclusively terrestrial; many are fully aquatic. Crustaceans also possess legs, contrary to the notion of having no legs at all, and their diets vary significantly, with many being scavengers or predators rather than strictly herbivores. Therefore, the statement regarding their legs and breathing mechanism aligns accurately with the known biological traits of crustaceans.