Platyhelminthes
Platyhelmithes, also known as flatworms, are mostly parasitic and the rest being free living. These worms have a cephalized nervous system with a head, or ganglion, which is attached to nerve cords that run along the length of the body. All flatworms lack a circulatory and respiratory system. To take the place of these functions their is absorbtion in the cell walls.
Flatworms can reproduce both sexually and asexually and most have developed a way of not self-fertilizing. Due to them being parasites, flatworms are very dangerous to the human population.
Flatworms can reproduce both sexually and asexually and most have developed a way of not self-fertilizing. Due to them being parasites, flatworms are very dangerous to the human population.