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9 / 18  Which hormone is primarily responsible for the contractions during labor?
A  oxytocin
B  estrogen
C  β -HCG
D  progesterone

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Source:  OpenStax, University of georgia concepts of biology. OpenStax CNX. May 28, 2013 Download for free at https://legacy.cnx.org/content/col11526/1.2
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