Which branch of biology focuses on the study of microscopic organisms?

Microbiology is the branch of biology that specifically studies microscopic organisms, which include bacteria, viruses, fungi, and protozoa. This field is vital for understanding various biological processes, disease mechanisms, and the roles of microorganisms in ecosystems. Microbiologists investigate how these tiny organisms interact with each other, their environments, and larger organisms, providing insights essential for advancements in medicine, agriculture, and environmental science.

The other branches mentioned in the choices focus on different aspects of biology. Botany deals with the study of plants, Zoology focuses on animals, and Ecology examines the interactions of organisms with each other and their environments. While all of these fields contribute to our understanding of life and the environment, only microbiology is dedicated to the study of microscopic organisms.