In the United States, until the 1940s, it was widely believed that _____ was/were able to protect the developing fetus from the effects of viruses and nicotine.

Question

Quizplus · Accepted Answer

Until the 1940s, it was widely believed that the placenta was able to protect the developing fetus from the effects of viruses and nicotine, but further research found that certain substances could still pass through the placenta and harm the developing fetus.

In the United States, Until the 1940s, It Was Widely