Which of the following is an evolutionary hypothesis to explain morning sickness?

A. It alerts the woman that she is pregnant so that she is careful not to expose herself to harmful substances.
B. It is a natural form of birth control.
C. It is an adaptation to protect the embryo from toxins.
D. It prevents too much weight gain during pregnancy.
E. It is a vestigial artifact left over from early mammalian ancestors.


Answer: C

Anatomy & Physiology

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