Explain the concept of Physical Changes. Describe the physical changes in boys and girls during adolescence.

Physical changes refer to the biological transformation that an individual goes through, including changes in body size, shape, and appearance. These changes occur during different life stages, and adolescence is a critical period when significant physical changes occur due to hormonal fluctuations. Adolescence marks the transition period from childhood to adulthood, during which physical changes have a profound impact on individuals' mental, emotional, and social well-being.

Physical changes occur at different rates in boys and girls due to hormonal differences. In girls, adolescence begins between the ages of 8 and 13 years and lasts until the age of 19. The first sign of puberty is breast development, which is caused by the release of estrogen. Other physical changes that occur during adolescence in girls include:

1. Menstruation: The first menstrual period, also known as menarche, usually occurs between the ages of 9 and 15 years. __________ ______ ______ _______ _________ ______ ___.
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