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(D) According to human embryonic development milestones:$1$. By the end of the first month, the heart is formed.$2$. By the end of the second month, l

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(D) According to human embryonic development milestones:$1$. By the end of the first month, the heart is formed.$2$. By the end of the second month, limbs and digits develop.$3$. By the end of the $12$th week (first trimester), most major organ systems are formed.$4$. During the $5$th month, the first movements of the fetus and appearance of hair on the head are observed.$5$. By the end of $24$ weeks (second trimester), the body is covered with fine hair, eyelids separate, and eyelashes are formed.

By the end of which week of pregnancy is the body of the fetus covered with fine hair, eyelids separate, and eyelashes are formed (in $weeks$)?

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