Which of the following groups contains the largest number of species?

Name: Which of the following groups contains the largest number of species?
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Arthropods contain the largest number of species with over one million described species, which is more than any other group of animals. Rotifers have around 2,200 described species, Annelids have around 17,000 described species, Phoronids have around 20 described species, and Polychaetes have around 12,000 described species.

Which of the Following Groups Contains the Largest Number of Species