The graphs below show the development of the cutting tools made by stone, one was made 1.4 million years ago, and the other was made 80 thousand years ago, viewing from back view, front view and side view.
Summarize the information by selecting and reporting the main features, and make comparisons where relevant.
The given diagram illustrates the cutting stone tool and how it was advanced from 1.4 million years ago to 80 thousand years ago.
The stone tool made 1.4 million years ago was more rounded at the top and bottom edges. From the front and the back view of the tool it is clear that the diameter in the middle was almost 5 cm and towards the top and bottom, it was around 3 cm wide. The side view shows that the tool was wider in the middle, with a diameter of around 3 cm and it tapered towards the top and the bottom ends. The back of the stone had fewer cuts than the front and they were also not very fine.
80 thousand years ago, this tool developed into a sharper, more refined tool. In the front and the back view it can be seen that the maximum diameter of the tool was the same as in the older tool, but it was more towards the lower side. The edges and surfaces had been smoothly polished with one end sharpened to form a tip and other end flat similar to the shape of a teardrop or a leaf. The side view makes it clear that it was much lesser in width than the older tool. The stone was more chiseled than the previous one.
Overall, it can be clearly seen that the stone tool was improved into a sharper and better one, over the years.