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Arthropods are a diverse group of invertebrates that include insects, arachnids, crustaceans, and more. A defining characteristic of arthropods is their growth process, which involves molting, also known as ecdysis. This process allows them to shed their exoskeleton periodically in order to grow larger and develop into different life stages. Since arthropods have a hard outer structure called an exoskeleton made of chitin, they cannot grow continuously as vertebrates do. Instead, they must molt to accommodate their growth and, in many cases, transition into different forms throughout their life cycles.

The other options do not apply to arthropods as a group. For example, possessing a backbone is a characteristic of vertebrates, not arthropods. Not all arthropods are herbivores; they have various diets that include carnivorous and omnivorous habits. Additionally, arthropods are defined by their exoskeletons, which distinguishes them from animals without such structures. Thus, molting is an essential and characteristic feature of arthropods that supports their growth and development.