Differentiate between menarche and menopause.

Explanation

**Step-by-Step Solution:**

1. **Definition:**
- **Menarche:** Menarche is defined as the onset or beginning of the menstrual cycle in human females. It marks the start of a female's reproductive capability.
- **Menopause:** Menopause is the phase that signifies the end of the menstrual cycle in females, marking the cessation of reproductive capability.

2. **Age of Occurrence:**
- **Menarche:** Typically occurs between the ages of 11 to 16 years. The exact age can vary depending on hormonal activation and individual development.
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