The pictures below demonstrate alternations of cutting tools that have been 
making
 Wrong verb form
made
through in
 the Stone Age. The cutting instrument had a lot of changes from 1.4 Change preposition
throughout
million
 Use synonyms
years
 ago to 0.8 Use synonyms
millon
 Correct your spelling
million
years
 ago. Use synonyms
Overall
, numerous transformations are evident and since Linking Words
1.4million
 Correct your spelling
1.4 million
years
 ago the the tool has undergone improvements in its shape.
 The most notable alternation was accomplished in the front view, where the instrument  has become more defined and polished, opening up many possibilities. Use synonyms
In addition
, the tip Linking Words
become
 more refined, Wrong verb form
became
while
 the shape took a quite circular form. Linking Words
However
, I must highlight an alternation from the side view in its Linking Words
dimesions
, wherein it has become thinner but Correct your spelling
dimensions
also
 more refined since 1.4 Linking Words
million
 Use synonyms
years
 ago. At the same time, tool B Use synonyms
comparing  
to A has become more sharpened. Wrong verb form
compared 
Another
 positive transformations are evident from the back view, noticeable in its size and polish. Replace the adjective
Other
However
, the height remained the same in both diagrams. 
 Taken as a whole, the cutting utensil has Linking Words
a 
undergone a couple of major changes since 1.4 Correct article usage
apply
million
 Use synonyms
years
 ago. I can mention that the development had only positive improvements, making Use synonyms
easier
 and Correct pronoun usage
it easier
usefull
 to use.Correct your spelling
useful