Final answer:
The evolution of the modern horse is characterized by changes in size, molar teeth, and foot structure over time.
Explanation:
The evolution of the modern horse is characterized by several key trends over time:
- Increase in size: The lineage leading to modern horses grew taller, from the small Hyracotherium to the larger Equus.
- Changes in molar teeth: Molar teeth gradually widened and elongated to adapt to grinding tough grasses.
- Evolution of foot structure: The modern horse lineage underwent changes in foot anatomy, including the degeneration of outer phalanges, allowing for faster running on hard ground.
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