Darwin hypothesizes that the minor variations we see within a single species such as variations in size shape and color of organisms are related to the more distinct variations seen across different species his theory of evolution explains how variations cause the origin of species. But the most elaborate criticisms of the origin of species which have appeared are two works of very widely different merit the one by professor klliker the well known anatomist and histologist of wurzburg the other by m flourens perpetual secretary of the french academy of sciences professor kllikers critical essay upon the . Criticism on the origin of species has 12 ratings and 1 review skyler said according to teleology each organism is like a rifle bullet fired straig. From a general summary to chapter summaries to explanations of famous quotes the sparknotes the origin of species study guide has everything you need to ace quizzes tests and essays. The origin of species study guide contains a biography of charles darwin literature essays a complete e text quiz questions major themes characters and a full summary and analysis