How does the small size of microorganisms (being invisible to the naked eye) contribute to their widespread distribution and ability to cause infections?

Their small size allows microorganisms to be easily carried by air currents, water droplets, dust particles, and even on the surface of objects, facilitating their widespread distribution. For causing infections, their tiny size allows them to readily enter the body through various openings (mouth, nose, cuts) and penetrate tissues, often going unnoticed until symptoms appear. This ease of dispersal and entry makes them effective agents of disease.