👉 Anna Biology, or Annelida Biology, is the scientific study of annelids, a diverse group of segmented worms that includes species like earthworms, leeches, and marine polychaetes. These organisms are characterized by their bilateral symmetry, segmented bodies (metamerism), and a true coelom, a fluid-filled body cavity lined with mesoderm. Annels exhibit a range of ecological roles, from soil engineers that aerate and enrich the earth with their castings to parasitic or free-living species in aquatic environments. Their biology encompasses various aspects, including their life cycles, which can be direct (complete) or indirect (alternate), their reproductive strategies, and their interactions with other organisms and their environments. Studying annelids provides insights into evolutionary adaptations, developmental biology, and ecological dynamics.