Which statement regarding the necessity of microorganisms is the most accurate?

Microorganisms play a fundamental role in the sustenance of life on Earth, making the statement that life is dependent on their existence the most accurate. They are crucial to numerous ecological processes, such as nutrient cycling, decomposition, and forming symbiotic relationships with other organisms. For instance, microorganisms like bacteria are essential for breaking down organic matter, returning nutrients to the soil, and supporting plant growth through nitrogen fixation.

Additionally, microorganisms contribute to the maintenance of healthy ecosystems, facilitate the food web by serving as a primary source of food for various organisms, and are involved in processes like fermentation and even digestion in higher organisms, including humans. Their presence is vital for the functioning of natural habitats and human health, demonstrating their indispensable nature in both controlled and natural environments. Thus, their existence underpins many biological processes crucial for life, confirming their essential role across ecosystems.