What type of bacteria are categorized as saprophytes?

Saprophytic bacteria are those that primarily thrive on decomposing organic matter. They play a crucial role in the ecosystem by breaking down dead and decaying material, which helps recycle nutrients back into the environment. By doing so, saprophytes contribute to soil fertility and the overall health of ecosystems, making them essential for ecological balance.

The other choices do not accurately describe saprophytic bacteria. While some bacteria can help individuals fight infections or produce antibiotics, these functions are associated with different types of bacteria, such as beneficial or probiotic strains. Pathogenic bacteria, on the other hand, are specifically known for causing disease, which is contrary to the role of saprophytes. Understanding these distinctions is key for students in the field of esthetics, as the knowledge of different bacteria types can relate to skin health and treatments.