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IMSO 2007 Taiwan Selection — Science First Round Question 16

IMSO Science · IMSO 2007 Taiwan Selection — Science First Round

Question 16

Toxins can harm a developing fetus. They usually enter the fetus by the process of
  1. blood flow from the mother to the fetus
  2. active transport from the ovary
  3. diffusion across placental membranes
  4. recombination of genes from the fetus and mother