Final answer:
The earliest modern humans at Cro-Magnon used Upper Paleolithic blade tools which were more efficient than earlier flake tools and represented an advancement in the blade tool industry.
Step-by-step explanation:
The earliest modern humans in Europe, like those at Cro-Magnon in France, used Upper Paleolithic blade tools. These blade tools were part of a more sophisticated toolkit that included tools made from a variety of materials, such as stone, antler, ivory, and bone. The blade tools were long, thin, and flat with a sharp edge, offering a much longer cutting edge and thereby more efficiency than the flake tools from the earlier Mousterian tradition. This advancement in toolmaking, sometimes referred to as the blade tool industry, represented a significant leap in human technology during the Upper Paleolithic era.