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the degree to which biology or the environmental contributes to one's development.
total effect of one's environmental events and circumstances that influence your development.
the second stage of prenatal development, lasting from the 2nd through the 8th week.
a genetic birth disorder resulting from an extra 21st chromosome, characterized by distinct facial features and greater likelihood of heart defects and mental retardation.
in prenatal development, a time when genetic and environmental agents are most likel to cause birth defects.
fetal alcohol syndrome ( FAS)
a birth condition resulting from the mother's chronic use of alcohol during pregnancy, it characterized by facial and limb deformities and mental retardation.
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