Karen has been using her stethoscope for many days to listen to her fetus' heartbeat. Today, for the first time, she detected her fetus' heart beat. Karen must be at least weeks pregnant.

Answer is : 8 weeks

Explanation:

The heart of fetus starts to beat at around 6th week of pregnancy and can be heard through sonographically however by week 8th, one can hear it through stethoscope.

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explanation:

answer:

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