There are more than 100 branches of the science. But the main branches are; physics, biology, chemistry, mathematics etc.
Biology deals with the study of living things. Physics deals with the behavior and properties of the matter.  The science of matter and its interaction with energy is called chemistry. A science dealing with the logic of quantity and shape and arrangement is called mathematics. The science of systemic operations is known as computer.
These branches are subdivide and interrelate to give other branches of science for example biochemistry, physical chemistry, molecular biology, computer, taxonomy, zoology, nuclear physics, electronics, anatomy, botany, genetics etc.
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