Bacteria and fungi break down/decompose the dead remains and waste products or organisms.
Advantages :
(i) Natural replenishment of soil.
(ii) Recycling of nutrients in the soil.
Detailed Answer:
Bacteria and fungi are living organisms which decompose or consume the dead remains of other organisms.
Advantages
(i) Decomposers degrade garbage and the organic wastes which would otherwise cause environment problem. It prevents foul smell and checks spread of disease.
(ii) Decomposers recycle the nutrients through biochemical cycle.
