What is most likely to cause morning sickness?

Name: What is most likely to cause morning sickness?
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Question

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Increased levels of estrogen and progesterone during pregnancy are believed to contribute to morning sickness. These hormones can affect the digestive system and cause nausea and vomiting.

Answer: C 
 As the uterus grows during pregnancy, it can put pressure on the stomach and contribute to feelings of nausea and vomiting. This is a common cause of morning sickness in pregnant women.

What Is Most Likely to Cause Morning Sickness