Respuesta :
All of the following are characteristic of the platyhelminthes except that they have highly developed digestive and nervous systems.
The division of platyhelminthes into Turbellaria which consists primarily of non-parasitic species like planarians and three totally parasitic groups Cestoda, Trematoda, and Monogenea is no longer used because it has been established that the turbellarians are not monophyletic. As a prehistoric step in the evolution of bilaterians, platyhelminthes were thought to exist.
According to the traditional understanding of the nervous system, an animal's highly complex nervous system coordinates its movements and sensory data by sending and receiving signals to and from various sections of the body. In order to react to such occurrences, the nervous system and endocrine system collaborate to detect environmental changes that have an effect on the body.
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