15 minutes

Phylum Annelida is made up of segmented worms divided into three classes: Subclass Oligochaetes (earth worms and aquatic worms such as Tubifex), Class Polychaetes (Nereis and thousands of other species that live in almost all marine habitats), and Leeches. Their segmented bodies, similar internal anatomy (seen in action through revealing new micro/macro imaging techniques), and developmental stages unite these diverse worms. (2006)