Chemistry is often called the Central Science. While physics studies the laws of nature, chemistry explores the way matter is put together, the composition of atoms, molecules and how they interact with one another. Every piece of matter is made up of atoms and molecules and they combine and interact with each other creating the astonishing set of materials that make up our world and universe in general. A very complex chain of chemical interactions create the molecules essential to life. So in a sense, biology and life sciences build on chemistry or chemistry tutoring.