Final answer:
Archaeological findings, particularly the Oldowan stone tools with cutmarks on animal bones and Mousterian scrapers, provide strong evidence for marrow extraction from bones in prehistoric times, indicating advanced tool use and societal customs.
Step-by-step explanation:
The question asks for evidence indicating that marrow was extracted from bones using stone tools. Archaeological sites have provided considerable insight into Paleolithic life and the use of stone tools. Studies of sites like Gran Dolina in the Atapuerca region reveal an abundance of cutmarks on animal remains, suggesting the use of tools for meat processing. The presence of Oldowan style tools constructed from local materials, along with large animal carcasses, implies not only the use of tools for extracting marrow but also the transportation of food, hinting at social cooperation. Additionally, Mousterian tools dating from 250,000 to 50,000 years ago, like those found in Israel, were used for more careful butchering of animals, an activity that would likely include marrow extraction. The evidence of stone tool use for breaking bones to access marrow, shapes a deeper understanding of early hominid life and technological advancements.