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Earthworms (Lubricus rubellus) are low-level animals because they do not have spines (invertebrates). These earthworms belong to the Oligochaeta class. The most important families of this class are Megascilicidae and Lumbricidae. Most people do not like and be disgusted when confronted directly with this earthworm. However, this one animal actually has a lot of useful potential for human life. For example in the field of agriculture, earthworm serves to destroy organic materials so as to improve aeration and soil structure. As a result the land becomes fertile and the absorption of nutrients by the plant is more good because the earthworm will increase the population of microbes that are beneficial to the plant.