Biology is the scientific learning of life. It is a subject field with a broad scope but has several unifying themes that tie it together mutually, a coherent field. As an example, all organisms are made of cells that process hereditary information encoded in genes, which can be transmitted to future generations. Another big theme is evolution, which explains the unity and style of life. Energy processing is additionally major to live because it allows organisms to maneuver, grow, and reproduce. Finally, all organisms are able to control their own internal environments.