Answer:
Her pesticide exposure likely occurred during embryonic period of development.
Explanation:
The embryonic period is marked by organogenesis (major organs forms) and development of different parts of the embryo. This period starts 3weeks after conception and last for two months. The mass of cells formed in the germinal stage becomes a distinct human.
The following event take place during this period;
i.) Formation of the central nervous system including the brain and spinal cord,
ii.) The head followed by the eyes nose mouth and ear are formed
iii.) Formation of the cardiovascular system
iv.) Limb buds appear that will form the arms and legs.
This is the most delicate period in prenatal period of development. The embryo at this stage is fragile and easily affected by teratogenic substances like viruses, drugs, chemicals (pesticides) or radiation that can cause deformities.
