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Molecular evolution is the process in which the sequence of proteins or nucleotides change, and cause mutations. This is the whole reason why the horses even evolved.

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Horses develop much like humans and other organisms.

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The horses have no vestigial organs.

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The only presence of homologous structures on a horse is the two little receded toes on the leg bones of the horse. This shows that the horses had a toed foot, instead of hooves.

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The population Merychippus, or hoofed horses out numbered the number of Mesohippus, or toed horses. This eventually led to the extinction of Mesohippus.

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Females go after the male horses that are most likely to survive. Because the horses with mutated hooves could survive with ease, the females wanted to mate those horses so their offspring could survive just like the other mutated horses.

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The changed horses migrated to different populations of horses. This added that mutation to that group of horses.

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Divergent, Parallel, or Convergent Evolution

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Divergent, Parallel, or Convergent Evolution

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The information I recorded suggests that the evolution of a horse is, in fact, divergent. This is because the horse started off as one species, then split off into two. As mentioned before, the original species died off.

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The horses feet had mutated. The middle toe, in which they rested most of their weight on, grew larger and gave them an advantage over the toed horses.

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Natural Selection or Survival of the Fittest

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Natural Selection or Survival of the Fittest

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The horse started developing hooves instead of toed feet through mutations. These mutations were just right for the environment they lived in, which gave them a greater advantage. Only the mutated horses survived and mated with other horses to get mutated offspring. After a long period of time, they started to out number the unchanged horses until it was only them.

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Variation- The foot mutations of a horse added variation to the horse population.
Inheritance- The offspring of the mutated horses inherited these helpful mutations, such as hooves instead of toes, making it more wide spread.
Selection- These mutations had and still have added advantages. The different foot type (Hoof, Toed foot, or in between.) made them more susceptible to survival, while the non-mutated horses die off because they can not survive.
Time- All of this takes a lot of time. Staring off with just one mutated horse to the entire population of horses.