During childbirth, physical stretching of the uterus causes the release of a hormone that results in stronger, more frequent contractions. These contraction increase the stretching of the uterus. This is an example of
A) a positive feedback loop, because the hormone increases uterine stretching.
B) a negative feedback loop, because the hormone increases uterine stretching.
C) a positive feedback loop, because a condition in the body causes an increase in a hormone.
D) a negative feedback loop, because a condition in the body causes an increase in a hormone.
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