The main branches of biology include: zoology, microbiology, botany, ecology, genetics, and biochemistry. 

• Microbiology is the study of living organisms which are not large enough to be seen with the naked eye. These microorganisms include bacteria, protists, fungi, viruses, and parasites. 
• Zoology is the study of animals (in the wild and in captivity), and how they interact with their ecosystems. 
• Botany is the study of plants including their structures, physiologies, and classifications. 
• Genetics is the study of genes and heredity. It can be used for gene therapy and treating diseases. 
• Ecology is the study of relationships between organisms and their environments. 
• Biochemistry is the study of the composition, chemical reactions, and structure of substances in living systems, as well as the changes they undergo during development.