The diagram provided elucidates the evolvement of cutting tools during the Stone Age and presents a comparison between a tool dating back 1.4 million years and another from 0.8 million years ago.
Overall, the tools demonstrate significant alterations in their sharpness, width, and thickness over the course of 600,000 years. While the front profile evolved to become sharper and wider, the side view transformed from thick and non-pointy to slim and sharp, with the size remaining constant at approximately 5 cm.
The front profile of the tool 1.4 million years ago appears less sharp and narrower compared to the tool from 0.8 million years ago, which is wider and more pointed. In terms of the back profile, the width increased similarly to the front profile, albeit with less sharpness at the top. On the contrary, the side view evolved from being thick and non-pointy to becoming slimmer and sharper both at the top and bottom.
Significantly, the size of the tools remained consistent at approximately 5 cm throughout the 600,000-year period, indicating stability in this particular aspect despite other notable changes in the tools’ features.