The diagrams illustrate the advancements of working tools in the Stone Age in different 
years
.
Use synonyms
Overall
, it can be seen from  both pictures the Linking Words
size
 and shape changed between Use synonyms
Tool
 A and Use synonyms
Tool
 Use synonyms
B
. The Use synonyms
Size
 of Use synonyms
tool
 Use synonyms
B
 became fatter from the back Use synonyms
view
  than it was in the initial Use synonyms
years
, Use synonyms
however
 Linking Words
side
 Use synonyms
view
 became thin and the front Use synonyms
view
 became  thicker.
It is conspicuous that  1.4 Use synonyms
million
 Use synonyms
years
 ago the Use synonyms
size
 of the front Use synonyms
view
 Use synonyms
tool
  was a little thin. Use synonyms
Whereas
 the Linking Words
side
 Use synonyms
view
 was thicker and the tip was not sharp. If look at Use synonyms
tool
 a from the back Use synonyms
side
 its width decreased, Use synonyms
while
 its height extended. The Linking Words
size
 of the Use synonyms
tool
 was 5 cm in 1.4 Use synonyms
million
 Use synonyms
years
 ago.
Probing ahead, in the year 0.8 Use synonyms
million
 ago the front Use synonyms
view
 of Use synonyms
tool
 Use synonyms
b
 was wider as compared to Use synonyms
tool
 A  1.4 Use synonyms
million
 Use synonyms
years
 ago and the tip became sharp enough to cut any objects. Use synonyms
Furthermore
, it can be experienced that the Linking Words
side
 Use synonyms
view
 of Use synonyms
Tool
 Use synonyms
B
 became very thin in shape as compared to Use synonyms
Tool
 A, it was  fatter than Use synonyms
Tool
 Use synonyms
B
. Use synonyms
Additionally
, the back Linking Words
view
 of Use synonyms
Tool
 Use synonyms
B
 became  thicker and the base of the Use synonyms
tool
 was larger in Use synonyms
size
 compared to Use synonyms
Tool
 A.Use synonyms