A teacher gives this comparison: an arthropod and a nematode are grouped together in modern discussions because both shed an outer cuticle during growth. The point being tested is: (284)

Molting or ecdysis is a key ecdysozoan character. Arthropods molt a chitinous exoskeleton, and nematodes molt a cuticle during growth. This question is designed as a comparison-based item to reduce thin-content style repetition and improve conceptual depth.