Which one of the following statements with re | vedclass

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(B) During the embryonic development of humans,cleavage refers to a series of rapid mitotic cell divisions of the zygote. In the second cleavage divis

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In the second cleavage division,one of the two blastomeres usually divides a little sooner than the second

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(B) During the embryonic development of humans,cleavage refers to a series of rapid mitotic cell divisions of the zygote. In the second cleavage division,one of the two blastomeres usually divides a little sooner than the second. Cleavage increases the number of cells (blastomeres) without increasing the total mass of the cytoplasm,as the size of the embryo remains constant during these early stages.

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

Which one of the following statements with regard to embryonic development in humans is correct?

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