Answer :
Final answer:
In the Upper Paleolithic era, the blade flake, which are thin, parallel-sided pieces, became the foundation of many stone tool forms. These blades resembled modern knife blades, being long, thin, flat, and sharp, which marked a significant advancement in the blade tool industry.
Explanation:
The basis of many Upper Paleolithic stone tool forms was indeed the blade flake. Blade flakes are essentially thin, parallel-sided pieces referred to in option (b). This fact can be attributed to the shift in human tool manufacturing during the Upper Paleolithic era, moving from the production of round flakes to blade tools. This was a significant advancement in the tool industry, making these blades a lot more efficient compared to their older counterparts. For instance, humans began assembling more complex tool kits, using a variety of materials like antler, ivory, and bone. These blade flakes were specially designed to look like modern knife blades – long, thin, flat, and with a sharp edge. The blade tool industry thus saw a great diversity of specialized tools being developed from stone flakes. In conclusion, the blade flakes were a groundbreaking discovery that marked a new era in the Upper Paleolithic era, setting the foundation for the advanced tool industry that we have today.
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