Morning Sickness During Pregnancy Can Vary from Mild Nausea to Persistent

Morning sickness during pregnancy can vary from mild nausea to persistent vomiting that can threaten the health of the mother and fetus. Morning sickness may have evolved as a mechanism to

A) keep women from gaining an unhealthy amount of weight during pregnancy.
B) limit the consumption of potentially harmful chemicals in food during early pregnancy.
C) reduce the libido of the woman and her attractiveness to a partner, thereby reducing potentially harmful sexual activity.
D) limit the physical activity of a women.
E) reduce the need for frequent urination.