Which microorganisms are commonly found on hair and skin and can break down sewage?

The correct answer highlights the broad category of organisms known as microbes, which encompasses a variety of microorganisms, including bacteria, fungi, viruses, and protozoa. Among these, certain bacteria are specifically known for their role in decomposing organic matter, including sewage.

Microbes are found widely in nature and play crucial roles in ecosystems, including the breakdown of waste materials such as sewage. Bacteria, a subset of microbes, are particularly effective in these processes because they can thrive in diverse environments and possess various enzymatic capabilities to degrade complex organic compounds.

While fungi are also important decomposers in various environments, including soil and decayed matter, they do not specifically represent the full range of organisms that can be involved in breaking down sewage. Viruses, on the other hand, typically infect living cells rather than participate in decomposing organic matter. The term "microbes" comprehensively covers all these tiny organisms, making it the most appropriate choice in this context.