See more synonyms on Thesaurus.com. noun, (used with a singular verb) 1. Biology. the science of heredity, dealing with resemblances and differences of related organisms resulting from the interaction of their genes and the environment.
Rx: A medical prescription. The symbol Rx is usually said to stand for the Latin word recipe meaning to take.. It is customarily part of the superscription (heading) of a prescription.
Types of Chemical Reactions (rxns.) â Chemical reactions occur when bonds (between the. electrons of atoms) are formed or broken. â Chemical reactions involve. l changes in the chemical composition of matter. (the making of new materials with new properties) l energy changes. â Symbols represent elements. â Formulas describe compounds. â Chemical equations describe a chemical reaction.