The developing fetus is most vulnerable to toxins, drugs, and infections during the first trimester of pregnancy because all of the basic structures and organ systems develop during this time.

Question

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During the first trimester, major organs and structures including the brain, heart, and lungs are formed. Exposures to harmful substances during this time can cause developmental abnormalities and potentially lead to lifelong effects.

The Developing Fetus Is Most Vulnerable to Toxins, Drugs, and Infections