Fetus A and Fetus B are developing within their own biological mothers who are unrelated. Fetus A and Fetus B both experience 3 weeks of very high blood lead levels: a known teratogen. After birth, Baby A is relatively healthy and appears to be unaffected by the high fetal BALs it experienced. However, Baby B is exhibiting clear signs of birth defects and developmental delays. Name two reasons why Baby A and Baby B may have been differentially impacted by this teratogen.

Fetus A and Fetus B are developing within their own biological mothers who are unrelated. Fetus A and Fetus B both experience 3 weeks of very high blood lead levels: a known teratogen. After birth, Baby A is relatively healthy and appears to be unaffected by the high fetal BALs it experienced. However, Baby B is exhibiting clear signs of birth defects and developmental delays. Name two reasons why Baby A and Baby B may have been differentially impacted by this teratogen.