Recent molecular phylogenetic analysis has shown that the marine animals known as peanut worms are not a separate phylum, but are definitely part of the family of annelids, also known as segmented ...

This film discusses the evolutionary significance of segmented worms, particularly earthworms, within the phylum Annelida. It explains the structure and function of their segmented bodies, including ...

General animal biology: Frog as a representative animal -- Materials of the animal body -- Body covering, skeleton, and body muscles -- Digestive systems and metabolism -- Circulatory systems -- ...