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

years

.

Overall

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

Mesohippus

, Meryvhippus and

Horse

. The four stages were separated by 1

million

, 1.5

million

and 1.5

million

years

respectively. Forty

million

years

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

which

Correct word choice

and

show examples

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

years

later, another type of

horse

called

Mesohippus

emerged. In

this

stage, the

Mesohippus

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

disappeared. The next stage was the emergence of Merychippus 15

million

years

ago. Compared to the

Mesohippus

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

this

period, their hooves remain three-lobed.

Finally

, in modern times, the

horse

, as we are familiar with it, appeared. At

this

stage, the

horse

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

last

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