Final answer:
Annelids are known for their segmented bodies, a characteristic known as metamerism. They are bilaterally symmetrical, possess a true coelom, and have a complete digestive system. Unlike arthropods, annelids do not have an exoskeleton and are not radially symmetrical.
Step-by-step explanation:
The correct statement regarding annelids is that they have segmented bodies. Annelids, such as earthworms and leeches, are part of Phylum Annelida, which is known for metamerism, or true segmentation, both internally and externally. This is in contrast to the other options provided - annelids do not have an exoskeleton, they are not arthropods (which are instead characterized by a hard exoskeleton and jointed appendages), and they do not exhibit radial symmetry, but rather bilaterally symmetrical. Annelids also have distinct physiological characteristics, such as a true coelom, a complete digestive system, and in many cases, chaetae, which are hair-like bristles made of chitin. For example, oligochaetes have fewer or no chaetae and no parapodia, while polychaetes have multiple bristles and parapodia.