The Diagram illustrates the improve of cutting devices in the Stone Age.
Looking from an overall perspective,the most noticable change is side viev of old cutting tool which was used in 0,8 milion year ago.
The cuttung tool A which was used in 1,4 million years ago is not so good for cutting.Because this tool is not very keen and to cut animal meats.And diagram shows that side viev is not keen and too bold to cut even fruits.It could be ruin every type of the products.Because of lack invention especially invention of polishing and sharpening methods and also devices.It is showed also tool’s back side.It looks same as front view.This tool’s above part which is 5 santimee=ter used for cutting .
Tool B which was used in 0,8 years ago is good and very sharp for general usage.Front side of Tool B looks like much more polish than tool A’s front side.And this makes device better for cutting hunted animals also fruits and vegetables.Side view of Tool b is more thinner than tool A and it is very noticable and signifivcant progress for the Stone age.Tool B whis was used in 0,8 years ago has also spesific par in above.This part isalso 5 santimeter.