Question

dr. chen is studying how lifestyle factors such as diet and exposure to pollutants affect the ways that genes are expressed throughout our lives. what is dr. chens specialty?
cross - cultural research
prenatal development
epigenetics
evolutionary psychology
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_____ can cross the placental barrier and have devastating effects, especially during the first 3 months of prenatal development.
incompatible maternal blood cells
none of these are correct.
teratogens
polygenetic factors

Explanation:

Epigenetics is the study of how environmental factors (like diet and pollutant exposure) affect gene expression. Teratogens are substances that can cross the placental barrier and harm prenatal development, especially in the first trimester.

Answer:

First question: Epigenetics. Second question: Teratogens.