The diagram illustrates the cutting tools development during 
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the stone
stone age
. Correct your spelling
Stone Age
Overall
, the diagram suggests that cutting tools became more sophisticated and efficient over time during the Stone Age. Linking Words
This
 is likely Linking Words
due to
 a number of factors, Linking Words
such
 as improvements in Linking Words
tool
-making techniques and the development of new materials.
In the first Use synonyms
tool
 which is labeled as being from 1.4 million years ago. It appears to be a biface, which is a type of stone Use synonyms
tool
 Use synonyms
that is
 flaked on both sides to create a sharp edge. The Linking Words
tool
 in the diagram is relatively small and round, with a pointed tip. It is Use synonyms
also
 quite rough in appearance, suggesting that it was not made with a great deal of care or precision.
Linking Words
On the other hand
, the second Linking Words
tool
 is Use synonyms
labeled
 as being from 800,000 years ago. It is Change the spelling
labelled
also
 a biface, but it is much larger and more symmetrical than Linking Words
Tool
 A. The edges of the Use synonyms
tool
 are Use synonyms
also
 much sharper, and it appears to have been made with more care and skill.Linking Words