make this simple & dumb down "The dissection highlights the earthworm's efficient digestive system, where each organ has a specific role in processing food. The muscular gizzard is particularly interesting, as it grinds food without teeth. The simplicity of the system, yet its effectiveness in nutrient absorption and waste expulsion, showcases the earthworm's adaptation to its environment. Understanding these structures enhances appreciation for ecological roles earthworms play in soil aeration and nutrient cycling