Entomology is a study of what?

Entomology is the branch of science that focuses specifically on the study of insects. This includes understanding their biology, behavior, ecology, taxonomy, and the roles they play in various ecosystems. Insects are a diverse and abundant group of organisms, making up a significant portion of the Earth's biodiversity, and their study is crucial for various fields, including agriculture, environmental science, and medicine.

The other options pertain to different areas of study: the study of plants falls under botany, bacteria are studied in microbiology, and birds are part of ornithology. Each of these disciplines investigates unique aspects of life forms and their interactions with the environment, but entomology distinctly centers on insects.