franz Boas is the undisputed father of four-field U.S. anthropology. One of his most important and enduring contributions to anthropology was a. the field’s earliest example of multi-timed and multi-sited ethnography. b. providing evidence that both biology and culture are susceptible to evolutionary forces, thus providing a framework for the comparative method. c. stressing the relevance of independent invention in human cultural history. d. showing that human biology was plastic, and that biology (including race) did not determine culture. e. expanding the local ethnographic focus to include a regional perspective.