Why is life impossible without microscoorganisms?

Life is impossible without microorganisms because they play essential roles in ecosystems, including nutrient cycling, decomposition, and soil formation. They are crucial for processes like nitrogen fixation, which supports plant growth, and they help maintain the balance of various biological systems. Additionally, microorganisms are vital for human health, aiding digestion and producing essential vitamins. Their absence would disrupt food webs and life as we know it would collapse.