Question

Platyhelinthes are unsegmented but why flatworms segmented ?

Answer 1

flatworms are unsegmented (as opposed to the phylum Annelida, which is made up of segmentedworms), and lack a complete digestive system. In general, though the body structure of flatworms varies, one end of the body of a flatworm is specialized for sensory input, and the other is used for movement.