- Archeology: This is the scientific study of physical evidence of the past human civilizations and societies.
- Astronomy: Scientific study of the heavenly bodies. It is the study of celestial objects and phenomena that take place outside the Earth’s atmosphere.
- Astrophysics: The branch of Astronomy concerned with the physical nature of heavenly bodies.
- Astrology: The science of predicting the course of human destinies by studying the position and movement of the heavenly bodies.
- Astronautics: The science of making and operating space vehicles and the laws governing their motion.
- Atomic Physics: The study of the internal structure of atomic nuclei as an isolated system of electrons.
- Audiology: The study of hearing and related disorders.
- Bacteriology: The study of bacteria in relation to disease.
- Biochemistry: The scientific study of the chemistry of living things.
- Biology:It is the scientific study of the life of living things.