What type of organism do annelids include?

Annelids are a phylum of invertebrate animals known for their segmented bodies. This characteristic segmentation is a defining feature of annelids, allowing for greater flexibility and complexity in movement. Earthworms, which are included in this group, exemplify many traits associated with annelids, such as a soft body, a coelom (body cavity), and a closed circulatory system. Other examples of annelids include leeches and polychaetes.

The other options represent different groups of organisms: jellyfish are cnidarians, sponges fall under porifera, and insects belong to the arthropod phylum. Each of these groups has distinct biological features that differentiate them from annelids, making Earthworms the correct representative of this organism type.