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| Column-$I$ (Time of gestation) | Column-$II$ (Changes in embryo) |
| $P$. After one month | $I$. Major organ systems are formed |
| $Q$. End of second month | $II$. Formation of heart |
| $R$. End of three months | $III$. Development of limbs and digits |
| $S$. During fifth month | $IV$. Movement of fetus and hair on head |
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