the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions | (biology) the existence of two or more forms of individuals within the same animal species (independent of sex differences) |
the way two individuals relate to each other | (chemistry) the existence of different kinds of crystal of the same chemical compound |
the chemical composition and properties of a substance or object | (genetics) the genetic variation within a population that natural selection can operate on |