What is menarch?

Explanation

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

1. **Definition of Menarche**: Menarche refers to the first occurrence of menstruation in a female. It marks the beginning of a female's reproductive capability.

2. **Age of Onset**: Menarche typically occurs during puberty, which is generally between the ages of 13 to 15 years. This is a significant developmental phase where a girl transitions into womanhood.

3. **Significance of Menarche**: The onset of menarche indicates that a female is no longer sterile. It signifies the beginning of her ability to conceive and bear children.

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