Life Span Development

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• A girl's first menstrual period, marking the start of reproductive capability.

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• The biological process of aging at the cellular and organ level.

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• The diamond-shaped soft spot at the top of an infant's skull; typically closes by 18 months.

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• Adults age 61 and older, characterized by age-related physiological and cognitive changes.

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• A normal developmental phase, typically between 6 and 12 months, when infants become wary of unfamiliar people.

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