GIRLS: Increased levels of estrogen, Development of breasts, Formation of mature eggs, Wider hips, Beginning of menstrual cycle, Starts puberty between ages 8-13, BOTH: Acne, Body hair, Increase in perspiration, Pubic hair, BOYS: Increased levels of testoterone, Facial hair, Deeper voice, Broadened shoulders, Muscle development, Production of sperm cells, Enlargement of external genitals, Starts puberty between ages 10-15,

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