What is the study of small living organisms called?

The study of small living organisms is referred to as microbiology. This field focuses on various microorganisms, including bacteria, viruses, fungi, and protozoa, examining their interactions, behaviors, and impacts on the environment, human health, and other living organisms. Microbiology is essential in various industries, including healthcare, where it helps in understanding disease processes and developing treatments.

In contrast, biochemistry relates to the chemical processes and substances within living organisms, cytology is the study of cells, including their structure and function, and pathology focuses on the causes and effects of diseases, particularly at the tissue and organ levels. Each of these areas has a distinct focus, but microbiology specifically deals with the microscopic, living entities that constitute a vital part of the biological world.