The diagram compares the evolvement of the cutting instrument in the Stone Age from 1.4 million years ago to 0.8 million years ago.
Overall
, Linking Words
this
special instrument has upgraded not only the size but Linking Words
also
the shape of the edges and the whole structure.
On one hand, we can observe that tool A had a primitive look with the raw edges, which is not suitable for cutting. Linking Words
Also
, the shape of it is significantly similar to the raw stone rather than a device for cutting. Linking Words
However
, it is understandable Linking Words
due to
the lack of crafting supplies.
Linking Words
On the other hand
, tool B has noticeably changed to an upgraded instrument with a sharp surface Linking Words
in contrast
to the rough surface of tool A. It is obvious that Linking Words
this
item, can easily used for cutting, and among the outlook, it enhanced and turns into a specific weapon with a sharp tip and a well-designed structure.Linking Words
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