the branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.

a process or set of rules to be followed in calculations or other problem-solving operations, especially by a computer.

"a basic algorithm for division"

the study of heredity and the variation of inherited characteristics.

the genetic properties or features of an organism, characteristic, etc.

the science that deals with the earth's physical structure and substance, its history, and the processes that act on it.

A representation of a biological process, system, or relationship by means of a mathematical equation or set of equations, often involving several random ... 

the abstract science of number, quantity, and space. Mathematics may be studied in its own right ( pure mathematics ), or as it is applied to other disciplines such as physics and engineering ( applied mathematics ).

"a taste for mathematics"