Which of the following organs is differentiat | vedclass

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(A) In human beings,the first sign of the growing fetus may be noticed by listening to the heart sound carefully through the stethoscope.After one mon

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Heart

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(A) In human beings,the first sign of the growing fetus may be noticed by listening to the heart sound carefully through the stethoscope.After one month of pregnancy,the embryo's heart is formed.By the end of the second month of pregnancy,the fetus develops limbs and digits.By the end of $12$ weeks (the first trimester),most of the major organ systems,including the limbs and external genital organs,are well-developed.

Which of the following organs is differentiated first during human embryonic development?

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