This document lists various subfields of biology, including zoology, entomology, ichthyology, herpetology, ornithology, mastozoology, botany, pteridology, microbiology, virology, bacteriology, protozoology, mycology, general biology, biochemistry, cytology, histology, physiology, taxonomy, biogeography, paleontology, phylogeny, genetics, applied biology, medicine, and agronomy.