What term refers to microorganisms that are present everywhere?

The term that refers to microorganisms that are present everywhere is "microbes." This term encompasses a wide variety of microorganisms, including bacteria, viruses, fungi, and protozoa. Microbes are ubiquitous, meaning they can be found in soil, air, water, and even within and on the human body. Their presence is essential for various ecological processes and can contribute to the overall balance of ecosystems.

In contrast, germicides are substances specifically designed to kill germs or pathogens but do not refer to the organisms themselves. Pathogens are a subset of microbes that specifically cause disease, whereas sanitizers are products aimed at reducing the number of microorganisms on surfaces but do not eliminate all microbes. Therefore, the correct terminology for microorganisms that exist all around us is indeed "microbes."