The sequence in evolution of horse was

Options

A. Equus, Eohippus, mesohippus, Merychippus
B. Eohippus, Mesohippus, Merychippus, Equus
C. Mesohippus, Eohippus, Merychippus, Equus
D. Merychippus, Eohippus, Equus, Mesohippus

Answer

To determine the correct sequence in the evolution of the horse, we will analyze the evolutionary lineage based on the information provided.

### Step-by-Step Solution:

1. **Identify the First Ancestor**:
- The first known ancestor in the evolution of the horse is **Eohippus**. This small, dog-sized animal lived in forested areas and is considered the earliest member of the horse lineage.

2. **Next in the Lineage**:
- Following Eohippus, the next significant ancestor is **Mesohippus**. This species appeared during the early and middle Oligocene epoch and was larger than Eohippus.

3. **Continuing the Evolution**:
- After Mesohippus, the lineage continues with **Merichippus**. This ancestor evolved during the middle and late Miocene and showed adaptations for grazing.

4. **Modern Horse**:
- Finally, the modern horse belongs to the genus **Equus**, which evolved from Merichippus. Equus includes all modern horses, zebras, and donkeys.

5. **Correct Sequence**:
- Therefore, the correct sequence in the evolution of the horse is:
- **Eohippus → Mesohippus → Merichippus → Equus**.

### Conclusion:
The correct answer is **Option 2: Eohippus, Mesohippus, Merichippus, and Equus**.

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