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

is not a new invention. In fact,

humans

have been using cutting

tools

since 1.4

million

years

ago.

However

, the

shape

of cutting

tools

used by

humans

have

Correct subject-verb agreement

has

show examples

been continuously developing. Currently, we've known

knifes

Correct your spelling

knives

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, cutters, and scissors as our main cutting

tools

. Back in the stone era,

humans

make their own cutting

tools

from rocks. It explains why the

shape

of the rock used as cutting

tools

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

tools

can be seen through the differences

of

Change preposition

in

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the

shape

between cutting

tools

from 1.4

million

years

ago with the one from 0.8

million

years

ago.

Humans

from 0.8

million

years

ago tend to make their cutting

tools

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

tools

is broader and the

shape

is narrowing down to the tip of the

tools

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

While

the

humans

from 1.4

million

years

ago tend to make their cutting

tools

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

million

years

ago. The

shape

of the

tools

can be seen rougher.

This

might

also

open a new view that the

tools

they used to sharpen the cutting

tools

have

also

developed

within

Change preposition

over

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time. Surprisingly, they

also

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

world.

Human

Fix the agreement mistake

Humans

show examples

have been continuously developing from

million

Correct article usage

a million

show examples

years

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

tools

Add a comma

tools,

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we can see how

humans

learn how to use

tools

until

ergonomic

Correct article usage

the ergonomic

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aspect

in

Change preposition

of

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their

life

Fix the agreement mistake

lives

show examples

.