👉 Nitrosococcales are microscopic organisms that primarily inhabit soil, water bodies, and aquatic environments. They play crucial roles in nutrient cycling by converting organic matter into nitrates (N2O), which are a source of nitrogen for plants. These microorganisms also serve as natural cleaners, breaking down organic material and releasing oxygen back into the atmosphere. Nitrosococcales can vary widely in size, ranging from microscopic spores to large colonies that can cover entire soil surfaces.