How is the respiratory system of the earthworm suited to their habitat?

The respiratory system of earthworms is adapted to their habitat through skin respiration, as they lack specialized lungs or gills. Their thin, moist skin allows for the efficient exchange of gases—oxygen is absorbed, and carbon dioxide is released—when they are in contact with moisture in the soil. This adaptation is crucial since earthworms live in damp environments, which facilitate the diffusion of gases. Additionally, their underground lifestyle reduces exposure to desiccation and helps maintain the necessary moisture for respiration.