Which of the following are so numerous that they are thought to be the most abundant of all marine arthropods?

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Crustaceans are known to be the most abundant of all marine arthropods, with over 67,000 species known to date. Barnacles are a type of crustacean, but they are not as abundant as some of the other groups within this category. Millipedes, Nematomorphs, and Apterygotes are not marine arthropods at all, but rather inhabit terrestrial environments.

Which of the Following Are So Numerous That They Are