Flat Worm
- The flatworm lacks respiratory organs.
- The lacking of these organs is the reason that most flatworms are microscopic.
- Flat worms respire using diffusion
- Flat worms have skin that provide a short diffusion pathway, allowing oxygen to come in and carbon dioxide to come out.
- This is why flat worms are flat. No one cell can be too far from the outside otherwise that cell will not respire.