Which of the two have a smaller voice box : grown up boys or grown up girls ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Voice Box (Larynx)**: The voice box, also known as the larynx, is an important part of the human body that plays a crucial role in breathing, swallowing, and producing sound (talking).

2. **Growth During Puberty**: The size of the larynx changes during puberty, which occurs between the ages of 11 to 19 years. This growth is more pronounced in boys than in girls.

3. **Comparison of Boys and Girls**: As boys go through puberty, their larynx grows larger and becomes more prominent. This is often referred to as the "Adam's apple," which is more visible in boys.

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