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Development
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The sequence of age-related changes that occur as a person progresses from conception to death
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Zygote
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A one-celled organism formed by the union of a sperm and an egg
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Prenatal period
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Exents from conception to birth, usually encompassing nine months of pregnancy
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Germinal stage
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The first phase of prenatal development, encompassing the first two weeks after conception
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Placenta
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A structure that allows oxygen and nutrients to pass into the fetus from the mother's bloodstream and bodily wastes to pass out to the mother
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Fetal stage
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The third stage of prenatal development, lasting from two months through birth
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Age of viability
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The age at which a baby can survive in the event of a premature birth
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Fetal alcohol syndrome
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A collection of congenital (inborn) problems associated with excessive alcohol use during pregnancy
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Motor development
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Refers to the progression of muscular coordination required for physical activities
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Cephalocaudal trend
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The head-to-foot direction of motor development
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Proximodistal trend
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The center-outward direction of motor development
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Maturation
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Development that reflects the gradual unfolding of one's genetic blueprint
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Developmental norms
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Indicate the typical (median) age at which individuals display various behaviors and abilities
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Attachment
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Refers to the close emotional bonds of affection that develop between infants and their caregivers
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Separation anxiety
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Emotional distress seen in many infants when they are separated from people with whom they have formed an attachment
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