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in the first four weeks of embryonic and fetal development,the? (a) fetus may sucl its thumb. (b) heart begins to beat (c) fetus can hear (d) sexorgans develop

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(a) fetus may suck its thumb.
(b) heart begins to beat
(c) fetus can hear
(d) sex organs develop

i know its not A, i dont think it would B. i want to say D. but i really dont know.
asked 8 years ago in Physics by Iron Worker Local 84 (770 points)

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