GRE Text Completion: JiJing 1373-GRE填空机经1373题 - B4S9E_7UCI352IXIA

The concept of increasing complexity of organisms has ____________ history among evolutionary biologists, and yet many laypeople would unhesitatingly say that the pattern applies to the history of life on Earth. A. an illustrious B. a sordid C. a curious D. a contentious E. a distinguished F. a fraught