Who studied the phylogeny of horse?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Phylogeny**: The term "phylogeny" refers to the evolutionary history and lineage of a species. It involves tracing back the common ancestors and the evolutionary changes that have occurred over time.

2. **Early Horse-like Creatures**: The first known horse-like creature is Eohippus, which lived in forested areas and had four toes on its feet. This species represents an early stage in the evolution of horses.

3. **Evolution of Eohippus**: Over time, Eohippus evolved into Mesohippus. This transition involved significant changes, including the development of stronger molars to help them eat harder plants and an adaptation for running, as indicated by the presence of a splint bone.

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