Miohippus has been classified as a browser (an animal that feeds on shrubs and trees) while Merychippus has been classified as a grazer (an animal that feeds on grasses). One valid inference that can be made regarding the evolution of modern horses based on this information is that:

A. Eohippus inhabited grassland areas throughout the world.
B. Pliohippus had teeth adapted for grazing.
C. Equus evolved as a result of the migration of Pliohippus into forested areas due to increased competition.
D. Ecological succession led to changes in tooth structure during the Eocene Epoch.

Timeline of Horse Evolution:
- 54.8 million years ago: Eohippus
- 33.7 million years ago: Miohippus
- 24 million years ago: Merychippus
- 5.3 million years ago: Pliohippus
- 1.6 million years ago: Equus

The evolution of modern horses can be inferred from the classification of Miohippus as a browser and Merychippus as a grazer, showcasing how horses adapted to different diets over time in response to environmental changes.

Explanation:

The evolution of modern horses can be inferred from the classification of Miohippus as a browser and Merychippus as a grazer. This suggests that over time, horses evolved to adapt to different diets based on environmental changes.

For example, Miohippus, being a browser, likely lived in areas with shrubs and trees, while Merychippus, a grazer, adapted to feeding on grasses. This evolution in dietary preferences and adaptations corresponds to changes in the environment and available food sources.

Therefore, a valid inference can be made that as environments shifted and grasslands replaced wooded areas, horses like Equus evolved to thrive in these changing landscapes, showcasing adaptations in tooth structure and feeding habits.

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