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Soil is a chief land resource and a vital component of the terrestrial ecosystem. The dynamic nature of the soil is due to the activity of the micro and macro organisms supported by availability of organic matter. Soil structure and porosity are much influenced by the activities of soil organisms. A vast number of organisms that include the bacteria, fungi, actinomycetes, mites, snails, beetles including dung beetles, millipedes, wood lice, springtails, nematodes, slugs, insects, enchytraeids and earthworms engineer a myriad of biochemical changes as decay of organic matter takes place. Perhaps the most significant contribution of the soil organisms to higher plants is that of organic matter decomposition. Among the organisms, which contribute to soil health, the most important are the earthworms.