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Unformatted text preview: Table 1. Kind of Horse Hyracotherium Miohippus Merychippus Equus # of toe bones 12 9 9 3 # of foot bones 4 3 3 3 # of ankle bones 7 6 4 4 #of heel bones 1 1 1 1 Total # of bones 24 19 17 11 Table 2. Kind of Horse Hyracotherium Miohippus Merychippus Equus # of toes 12 9 9 3 Relative length of foot 11 16 25 37 Height of teeth (mm) 14 14 19 34 Questions: 1. The changes that occurred in the environment were that it went from being a more wooded area to a more open plains area due possibly to deforestation. 2. The teeth grew larger in order to make grazing on grasses easier. 3. From Hyracotherium to Equus the horse became larger. 4. The foot grew larger as the number of toes decreased and the size of the toes increased. 5. Natural selection may have caused the changes in the horses because the horses needed to adapt to changes in the environment. They did not need as many toes since the land was becoming less wooded and more open plains. This meant that they also possibly had to become faster runners since they were out in the more open plains....
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This note was uploaded on 10/31/2010 for the course BIO 1320 taught by Professor Scott during the Spring '10 term at Western New Mexico.
- Spring '10