What are splint bones? How do they support organic evolution?

Explanation

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

1. **Definition of Splint Bones:**
- Splint bones are vestigial structures found in horses. They are remnants of the second and fourth digits of the forelimbs and hind limbs.

2. **Location of Splint Bones:**
- In horses, splint bones are located in both the front and hind legs. Specifically, they correspond to the areas where the second and fourth toes would have been present in their ancestors.

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