Which freshwater invertebrates are characterized by segmented bodies and jointed limbs?

The organisms described in the question, which feature segmented bodies and jointed limbs, are indeed categorized as arthropods. Arthropods encompass a diverse group of invertebrates including insects, spiders, crustaceans, and other related species. Their segmentation allows for greater flexibility and movement, while the presence of jointed limbs enhances their ability to interact with the environment, such as swimming, walking, or burrowing.

In contrast, the other groups mentioned do not fit this description. Worms, for instance, are primarily non-segmented or exhibit simple segmentation without jointed appendages, making them distinct from arthropods. Mollusks have a soft body structure and generally lack segmentation and jointed limbs, relying on a muscular foot for movement. Echinoderms, such as starfish and sea urchins, feature a unique body plan with radial symmetry and do not possess segmented bodies or jointed limbs.

Thus, the defining characteristics of segmented bodies and jointed limbs distinctly identify arthropods as the correct answer.