Exposure to Toxins Is Particularly Dangerous to the Embryo in the First

Multiple Choice

Exposure to toxins is particularly dangerous to the embryo in the first trimester of pregnancy because

A) its high surface-to-volume ratio provides a great deal of exposure to the toxin.
B) rapid cell division is taking place during this period.
C) tissue differentiation is occurring at its highest levels during this period.
D) branching sequences of developmental pathways are in their early stages in this period.
E) b, c, and d