Bacteria play a crucial role in nutrient cycling within ecosystems, contributing to processes such as decomposition, nitrogen fixation, and organic matter mineralization. Decomposers, particularly bacteria, break down dead organic material, releasing essential nutrients back into the soil for plant uptake. Nitrogen-fixing bacteria convert atmospheric nitrogen into forms usable by plants, promoting growth and productivity. This symbiotic relationship supports overall ecosystem health, facilitates energy flow, and maintains soil fertility, demonstrating the integral role of bacteria in sustaining ecological balance.