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Researchers want to study the effects of teratogens

User Pantelis
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Answer:

Teratogens can cause severe birth defects, malformations, or terminate the pregnancy altogether (Jancárková, & Gregor, 2000). The placenta is known as an effective barrier from any detrimental pathogen that can potentially hurt the fetus.

Step-by-step explanation:

User LoranceChen
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