The diagram depicts the evolution of stone-cutting tools from 1.4 million years ago to 0.6 million years ago.
Overall, siginficant improvements in shape and efficieancy are evident over this period.
First, Tool A, which dates back to nearly one and a half million years ago, had a rudimentary and bulky appearance. Both the front and back views show an asymmethical shape, while the side view reveals its blunt thickness, making it an ineffective cutting tool without a specific sharp tip.
In contrast, Tool B, from 0.6 years ago, underwent notable refinement, becoming sharper and more chiselled. This tool is 2-3 centimetres prolonged with a more symmethical, teardrop-shaped design. Ultimately, in a comparison between two tools’ edges, Tool B’s ones are smoother and more sophiscated than its previous version, indicating a clear improvement in cutting efficiency.
In summary, the development from Tool A to Tool B shows advancements in both form and functionality, reflecting the progress in tool-making techniques during the Stone Age.