The given diagram depicts the evolution of modern cutting tools from 0.8 million years ago, compared with obsolete cutting versions from 1.4 million years ago.
Overall, there are huge changes between these cutting tools, including their size, shape and function. More recent tools had expanded in size, were sharper and, thus becoming a more effective cutting instrument.
As can be clearly seen from the diagram, tool A, emerging in 1.4 million years ago, it was perceptible that it was rudimentary and small, at a length of approximately 7 to 8 cm. This tool had no apparent shape, and was very rough and blunt. Noticeably, the surface of this version appeared not consistent and smooth, lacking the capabilities of cutting tools.
By contrast, Tool B, dating roughly 0,8 million years ago, had experiencing the erosion of time more than half of a million years, the tool got an incredibly altered change and improved to become larger with 10 centimeters in length, a wider base, and a pointier tip, thinner from the side view made it got a huge upgrade at sharpness levels. The surface of this tool was also smoother on both its front and back sides and synchronized teardrop in shape, which utilize in cutting effect and domestic use.