The diagram below shows the development of cutting tools in the Stone Age

The given process illustrates the advancement of the cutting tools in the Stone Age.
As can bee seen from the diagram, there are various transformations that the equipment underwent during the period of 1.4 million years ago and 0.8 million years ago. It is also evident that the tool had been enlarged in terms of width and height.
Concerning the front view, 0.8 million years ago, it had a raindrop-like shape, which had been evolved from the snuggling shape. The most significant shift was the sharp tip of the tools, which was the lack of that 1.4 million years ago.
Anologously, both side view and back view of the equipment had also been through changes. While the side view had been flattened, the back view displayed a remarkable growth in height and width that resulted in a more suitable shape to grab.