Final answer:Crustaceansfall under the category of ecdysozoans (a), within the Superphylum Ecdysozoa which also includes arthropods and nematodes. A distinct characteristic of ecdysozoans is their cuticle, a protective exoskeleton, and the process of ecdysis where they shed their cuticle. Specifically, crustaceans are part of well-adapted arthropod phylum.Explanation:The correct answer to your question is a)ecdysozoans. Crustaceans, which include organisms such as crabs, shrimp, and lobsters, fall under the category of ecdysozoans. This classification is within the Superphylum Ecdysozoa, which is known for its large number of species including the phylum Arthropoda (the arthropods) and phylum Nematoda (the roundworms).The defining characteristic of ecdysozoans is thecuticle- a tough, flexible exoskeleton that protects these animals. All members of this superphylum go through a molting process that includes ecdysis, the actual shedding of the old exoskeleton. This process is crucial for the growth of these organisms.The animals in the ecdysozoan clade are noted for their incredibleresilienceand complexity of life cycles. More specifically, crustaceans, are a part of the arthropod phylum, renowned for being one of the most successful animal phyla on Earth.Learn more about Crustaceans here:brainly.com/question/31687670#SPJ11...

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