The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. The embryo's heart is formed . . . . . . .
- ABy the end of the second month of pregnancy
- BBy the end of the first trimester
- CAfter one month of pregnancy
- DDuring the fifth month
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$A$: The first sign of a growing foetus may be noticed by listening to the heart sound through the stethoscope.
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