Give the smallest and longest bone of human skeleton.

Explanation

**Step-by-Step Solution:**

1. **Identify the Smallest Bone:**
- The smallest bone in the human skeleton is the stapes.
- It is located in the middle ear and is one of the three auditory ossicles (the other two being the malleus and incus).

2. **Function of the Stapes:**
- The primary function of the stapes is to transmit sound vibrations from the incus to the oval window of the inner ear.
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