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genetic drift is the reason way all the horses of the world are different sizes,color,shape,and why some migrate differently.

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http://www.lovehorsebackriding.com/images/xhorse-anatomy-diagrams-03.jpg.pagespeed.ic.aTOzSTBDZU.jpg

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A body of a small dog but has long legs small head top and bottom teeth no back. A straight tail and brown with strips to blend in. Our modern horse of today is tall long neck all teeth has hooves and a mane and tail.

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Horses about 55 million years ago migrated to different parts of Canada. Some different later on about 45 million years they were also in Asia . They moved around to breed or to feed.

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Their sexual selection was beneficial because it was persistent. It also evolved from being the size of a small dog to being very tall creature. When a horse is ready to mate the females become meaner the males also do this

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Mutation of the horse started with their body size, then teeth over time more and more teeth came but the modern horse today does not have the same amount of teeth as 45,000,000 years ago.

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Variation
Inheritance
selection
Time
Variation shows the different stages of evolution.
Inheritance
Selection has to do with change of the environment.
Time
every thing changes of over time.because every thing must evolve

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Explain The Evolution Of a particular Animal

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Explain The Evolution Of a particular Animal