(A) In human embryonic development,the heart is the first organ to form and function. The heart begins to beat at the end of the $4^{th}$ week of preg

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(A) In human embryonic development,the heart is the first organ to form and function. The heart begins to beat at the end of the $4^{th}$ week of pregnancy. By the end of the first month of gestation,the embryo's heart is formed and starts beating,which can be heard by a stethoscope.