Final answer:
On average, one egg is released from a human ovary each month, a process known as ovulation, which occurs around day 14 of a typical 28-day menstrual cycle. This starts with puberty and continues until menopause, around the age of 52.
Step-by-step explanation:
In humans, the process of egg production begins before birth, with ovaries harboring up to a million or more eggs. However, these eggs remain immature until puberty. Each month, on average, one egg matures and is released from the ovaries in a process known as ovulation.
Around the midpoint of a woman's menstrual cycle, typically on day 14 in a 28-day cycle, ovulation occurs. In instances where both ovaries release an egg, and if both eggs are fertilized, the result may be fraternal twins.
Commencing in puberty and continuing until menopause, usually by the age of 52, this process underscores the reproductive years of an individual. By menopause, the stock of viable eggs is nearly depleted, and hormonal support for the cycle diminishes.