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(A) The presumptive areas (the regions of the embryo that will develop into specific organs or tissues) are first mapped and become evident during the

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Blastula

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(A) The presumptive areas (the regions of the embryo that will develop into specific organs or tissues) are first mapped and become evident during the $Blastula$ stage.During the $Gastrula$ stage,these cells undergo morphogenetic movements to form the three germ layers ($Ectoderm$,$Mesoderm$,and $Endoderm$).In the $Post-gastrula$ stage,the process of $Organogenesis$ begins,where these germ layers differentiate into specific organs.Therefore,embryologists can identify the future fate of cells (presumptive organs) in the $Blastula$ stage.

Embryologists can presume the future organs of the embryo in

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