Earth worm is form into group decomposer in ecology. It's has 2 group follow their live and food behavior that is to say earth worm that live in soil surface or under carcass and earth worm that live under the soil by digging hole. By the first group of earth worms have digestion efficiency organic compound better than second group. and have faster reproduction. In nature earth worm have long life since 4-10 years depend on type of earth worm. When we bring them grow. We find the solution. Earth worm have short life generally average not to 2 years. Earth worm has benefit more than wicked things. It's can burrow in underground deeper 20 m. Which nature harrows and nutrition to soil.