- The resporation system in annelidas like earthworms happens via the skin.
- This being said sometimes they are found to have gills, which in tube-dwellers and burrowers are found by which ever side has the stronger water flow.
- Earthworms do not have lungs but instead they use their skin to exchange gas.
- They get oxygen from the soil and release carbon dioxide from their skins.
- Leeches although they live in water unlike the earthworm use the same methods of breathing as the earthworm.
- They get oxygen from the soil and release carbon dioxide from their skins.
- Once they get oxygen, they exchange gas in their body through the circulatory system. This makes it so that their skins need to keep wet to make gas exchange possibly.