The diagram illustrates the evolution of cutting tools from two different periods in the Stone Age. It compares Tool A, made 1.4 million years ago, with Tool B, crafted 0.8 million years ago, highlighting the front, side, and back views of each tool.
Tool A, created earlier, has a more primitive design. It is long and pointed, with sharp edges visible from both the front and side views. The back view shows a narrow, sharp blade, but overall, the tool appears rough and less symmetrical.
In contrast, Tool B, made later, demonstrates a significant advancement in craftsmanship. It has a more refined, teardrop shape, with a sharper and wider blade. The side view shows a slimmer profile compared to Tool A, and the back view is smoother and more polished, indicating improved cutting efficiency.
Both tools are approximately 5 cm in length, but Tool B’s design is clearly more sophisticated, suggesting technological progress over time. The transition from Tool A to Tool B reflects the development of more efficient and practical tools as humans advanced.