The diagram illustrates the transformation of the cutting tool between two different time periods within the Stone Age: 1.4 million years ago and 0.8 million years ago.
Overall, despite the similarity between the two cutting tools in terms of size and shape, the cutting tool from the later period shows some distinct improvements in size and effectiveness.
Both cutting tools are relatively similar in shape and size, being approximately 10 centimeters long. The front view shows that the edges of Tool A are rough, while those of Tool B are smooth, indicating that Tool B is clearly a more effective cutting instrument.
The most distinct difference between the tools is revealed from the side view. While Tool A is irregular, Tool B is significantly slimmer and symmetrical with a regular, flattened shape.
From the back view, Tool B looks much wider with a rounder body shape in comparison with Tool A.
