original: the organic matter in soil derives from plants and animals .
simplifications: the organic stuff in dirt comes from plants and animals . the organic material in soil comes from plants and animals . the organic matter in soil derives from plants and animals . organic soil matter comes from dead plants and animals . the organic stuff in dirt comes from plants and animals . the organic matter in soil is got from plants and animals . the organic matter in soil is derived from plants and animals . the organic matter in soil comes from plants and animals .