The pictures
illustrate how the horse has evolved from its pregistoric anchestor to the
contemporary horse through four stages, beginning at forty million years age,
then 30 million years ago, fifteen million years later and finally the modern
horse. There is special attention given to the shape of the foot which is shown
in separate places in the picture to highlight its changes.
Looking at these
pictures as a whole, during the process of the evolution of the horse, it has
increased on size and the modern horse is two times bigger than the horse at
the first stage. Also, it has grown hair along the back of the head and neck,
called a mane, and the tail is longer. In addition to that, the foot has
changed from five toes to a single toe, nomely a hoof.
The first period of
the time, at forty million years ago, the horse, which had the of the if
compared smallest body and the shortest tail with no hair seen on the back of
the head, was known as Eahippus. The stucture of the foot was made up of four
toes with are shorter toe to the right. In the second stage the mesohippus era
it had larger body and longer tail. It started to grow small mane and the foot
consisted of two less toes than the horse of ten million years before. In the
next stage, merychippus, living is million years in the past, was larger in
size, had thicker mane land longer tail than both previous stages. The number
of toes was still the some as mesohippus, but the middle of the toes was
moderately longer than in the second stage. Last, the modern horse was the
largest physical specimen the longest tail and the thickest mane over the all
stages. Its ears were also more pointed than three stages before. Moreover, the
modern horse had one big foot without toes, called a hoof, which seem different
compared to its prehistoric predecessors. (Rp.54.121) RP
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