What is the primary characteristic that groups phyla within the Ecdysozoa?

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The primary characteristic that groups phyla within the Ecdysozoa is the shedding of their exoskeletons. Ecdysozoa includes phyla such as Arthropoda (insects, crustaceans), Nematoda (roundworms), and Tardigrada (water bears), all of which molt their exoskeletons to grow and develop. The other choices, such as having tropchophore larvae, spiral cleavage, or segmentation, are characteristics found in other groups of animals but not specific to Ecdysozoa.

What Is the Primary Characteristic That Groups Phyla Within the Ecdysozoa