What is the field of study that focuses on small living organisms?

The field of study that focuses on small living organisms is microbiology. This branch of science specifically investigates microorganisms, which include bacteria, viruses, fungi, and some protozoa. Microbiology is crucial for understanding various biological processes, human health, disease mechanisms, environmental interactions, and applications in industries like pharmaceuticals, agriculture, and food production.

While botany deals with plant life, and zoology studies animals, including larger organisms, these fields do not focus specifically on the microscopic organisms that microbiology specializes in. Ecology, on the other hand, examines the interactions between organisms and their environment but does not focus solely on the study of small living organisms. Thus, microbiology is correctly identified as the field that emphasizes the study of small living organisms.