The diagram below shows the development of cutting tools in the Stone Age. Summarise the information by selecting and reporting the main features and make comparisons where relevant. You should write at least 150 words.

Cutting

tools

Use synonyms

is not a new invention. In fact,

humans

Use synonyms

have been using cutting

tools

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since 1.4

million

Use synonyms

years

Use synonyms

ago.

However

Linking Words

, the

shape

Use synonyms

of cutting

tools

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used by

humans

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have

Correct subject-verb agreement

has

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been continuously developing. Currently, we've known

knifes

Correct your spelling

knives

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, cutters, and scissors as our main cutting

tools

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. Back in the stone era,

humans

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make their own cutting

tools

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from rocks. It explains why the

shape

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of the rock used as cutting

tools

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we usually see in the museum is rugged. The development of cutting

tools

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can be seen through the differences

of

Change preposition

in

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the

shape

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between cutting

tools

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from 1.4

million

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years

Use synonyms

ago with the one from 0.8

million

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years

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ago.

Humans

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from 0.8

million

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years

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ago tend to make their cutting

tools

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more pointy. They pay attention to the detail of putting a handle the bottom side of the

tools

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is broader and the

shape

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is narrowing down to the tip of the

tools

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, which we suggest is the sharpest part they use to cut things.

While

Linking Words

the

humans

Use synonyms

from 1.4

million

Use synonyms

years

Use synonyms

ago tend to make their cutting

tools

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more even. It is not as sharp as the one from 0.8

million

Use synonyms

years

Use synonyms

ago. The

shape

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of the

tools

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can be seen rougher.

This

Linking Words

might

also

Linking Words

open a new view that the

tools

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they used to sharpen the cutting

tools

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have

also

Linking Words

developed

within

Change preposition

over

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time. Surprisingly, they

also

Linking Words

consider the ergonomic factor. They considered

to make

Change the verb form

making

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a more comfortable handle which we can see from tool B. The development of cutting

tool

Fix the agreement mistake

tools

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is one of the most important

thing

Change to a plural noun

things

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in

this

Linking Words

world.

Human

Fix the agreement mistake

Humans

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have been continuously developing from

Use synonyms

million

Correct article usage

a million

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years

Use synonyms

ago, including the brain of

the

Correct article usage

apply

show examples

human

Fix the agreement mistake

humans

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. From the development of

the

Correct article usage

apply

show examples

cutting

Use synonyms

tools

Add a comma

tools,

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we can see how

humans

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learn how to use

tools

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until

ergonomic

Correct article usage

the ergonomic

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aspect

in

Change preposition

of

show examples

their

life

Fix the agreement mistake

lives

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.