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why is it difficult to determine the prenatal effects of environmental agents such as drugs, alcohol, and pollution

User Fadd
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1 : to cause to vibrate in a definite pattern polarize light waves. 2 : to give physical polarity to. 3 : to break up into opposing factions or groupings a campaign that polarized the electorate. 4 : concentrate sense 1 recreate a cohesive rock community by polarizing

User Kirimi
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