48. According to Daniel Dennett, which of the following best describes Darwin’s contribution to the scholarship? (A) His idea is the best single idea in the history of natural science. (B) His idea separates physics from chemistry. (C) His idea differentiates meaningless world from the meaningful. (D) His idea unifies what was once taken as two disparate worlds: the meaningless mechanical world and the meaningful cultural one. (E) His idea crisscrosses the empirical science and social science.