There is no true circulatory system in the all flatworms, but like all organisms, they need oxygen to survive. Cellular fluids are distributed throughout the organism's cells to distribute gases, nutrients, and waste products. The gases diffuse on the moist outer surface.
The flatworm has a very simple nervous system with two nervous cords running on either side. It has two simple brains called ganglia, which are a simple bundle of nerves. It also has two eye spots to help to sense light.
The flatworm has a very simple nervous system with two nervous cords running on either side. It has two simple brains called ganglia, which are a simple bundle of nerves. It also has two eye spots to help to sense light.