Final answer:
Members of Onycophora and Tardigrada share a collagenous/chitinous cuticle that they periodically molt, which Nematoda do not.
Step-by-step explanation:
Members of Onycophora and Tardigrada share the feature of having a collagenous/chitinous cuticle that covers their bodies and the need to periodically molt this cuticle during growth. This feature is not shared with members of Nematoda.
Onychophora, Tardigrada, and Nematoda are three distinct phyla within the animal kingdom. While they share certain characteristics, they also exhibit unique features that differentiate them.