Biology is the study of life, including its structure and evolution.Biologists study how life survives and reproduces.Chemistry is the study of matter, including the structure of atoms and molecules.Chemists study how various substances interact with each other.Astronomy is one of the oldest sciences.Astronomers study the structure and evolution of the universe, including the study of stars, planets and galaxies.Geology is the study of the structure and history of the Earth and other planets.Geologists study different types of rocks, earthquakes and the different layers of the Earth.Mathematics is the study of numbers, shapes, patterns and change.Mathematics is used by all other branches of science.