a - an informed conjecture of what might be true b - coherent body of interconnected statements, based on reasoning and evidence, that explain a variety of observations c - change over time in the proportions of individuals in a population that differ genetically in one or more traits d - all species (living and extinct), have descended from one or a few original forms of life e - features that appear designed to fit organisms to their environment f - individuals of a population with superior features survive and reproduce more successfully than individuals with inferior features g - reconciliation of darwinian evolution with the facts of mendelian genetics h - hypothesis attributed to lamarck suggesting that traits acquired during an individual's lifetime are inherited i - a group of organisms that interact ecologically and reproductively more often than with members of other groups of the same species j - a taxonomic group whose members are all derived from a common ancestor