a type of mathematics that uses letters and symbols in place of numbers a substance that combines to form the structure of proteins a short tube joined to the intestine; extra information at the end of a book to state firmly or confidently a group of people or animals of the same type; a country controlled by another country the ability to do something in a satisfactory or effective way the management of land and water in ways that stop it from being damaged to limit; to force someone to do something they don't want to do something that has developed or been obtained from something else to see or show a difference between things the movement of light in many directions when different styles, ideas or designs combine to form something new; in physics: when atoms combine to produce nuclear energy not affected by something, such as a disease a round shape a description of the main features of something in part; in some degree; not wholly concerning the last little bit, after the rest has gone or ended an example of something, especially of a plant or an animal; a small amount of blood or urine a good quality happening or existing in many places; affecting many people