The diagrams below show the development of the horse over a period of 40 million years. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The diagrams present the 4 steps of the evolution procedure of horses regarding the variation of their feet over the past 40

million

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years

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.

Overall

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, there are totally four time periods in the whole process, Eohippus,

Mesohippus

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, Meryvhippus and

Horse

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. The four stages were separated by 1

million

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, 1.5

million

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and 1.5

million

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years

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respectively. Forty

million

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years

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ago, one of the species of horses was called Eohippus,

which

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and

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every horseshoe had five forks. Compared to modern horses, the Eohippus were very small. As for their appearance, some spots can be seen on their skin. 10

million

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years

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later, another type of

horse

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called

Mesohippus

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emerged. In

this

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stage, the

Mesohippus

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had a bigger body and one of the toes on their hooves was diminished into three. At the same time, the spots they originally had have

also

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disappeared. The next stage was the emergence of Merychippus 15

million

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years

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ago. Compared to the

Mesohippus

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, the Merychippus seemed taller and bigger. It can be noticed that their fur is darker and spotted. In

this

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period, their hooves remain three-lobed.

Finally

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, in modern times, the

horse

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, as we are familiar with it, appeared. At

this

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stage, the

horse

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finished its development period and showed more obvious features. Houses are much stronger than the

last

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evolution and their hooves are no longer separate, but one.