The given illustrations elucidate the evolution of stone cutting tools used in the Stone Age.
Broadly speaking, it is apparent that the notable difference between the cutting tools in two periods is the size, with the latter version is larger. Additionally, tool B shows the sharper shape than tool A.
To commence, 1.4 million years ago, the tools were thin and measured around 7 cm in length. Moreover, the appearance of the tools was uneven, with the front and back view shaped differently, and this stone pieces exhibited a rough surface.
After 600 000 years, the cutting tools in the Stone Age became more advanced. First of all, they were larger, measuring nearly 10 cm in length. It is evident that those tools had the tear-drop shape, big at the base while having sharp tip. Interestingly, the tools in 0.8 years ago experienced the smooth and even surfaces in both sides, having the significant change after that period of years