The world of Platyhelminthes
Platyhelminthes are very similar to cnidaria, in that they universally respire using diffusion through their membranes. Platyhelminthes have few body structures, like organs, and this means that Platyhelminthes are restricted to a nearly flat body structure. This phylum has a 3 layer membrane surrounding the organism. These layer are all permeable, to allow oxygen and nutrients into the organism. View the sub pages for examples of Platyhelminthes!