The first important group of organisms we refer to as the nutrient storage organisms. They are responsible for decomposing organic matter, retaining nutrients in their bodies and building soil. These are bacteria and fungi. Both bacteria and fungi have specific functions they perform in breaking down organic matter while assimilating minerals and nutrients into their bodies. The bacteria play a role in soil building by forming the first stages of soil structure called microaggregation. As the soil develops, fungi bind together these microaggregates to form pore space called macroaggregation. These two actions create a healthy soil structure that allows your soil to breathe and become a buffer to both draught and excess water.