Which structure differentiates the gastrula f | vedclass

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(A) The gastrula is characterized by the formation of three germ layers ($Ectoderm$,$Mesoderm$,and $Endoderm$).During the process of gastrulation,cell

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$3$ germ layers

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(A) The gastrula is characterized by the formation of three germ layers ($Ectoderm$,$Mesoderm$,and $Endoderm$).During the process of gastrulation,cells from the surface of the blastula undergo morphogenetic movements to rearrange themselves into these three distinct layers.In contrast,the blastula is a hollow sphere of cells surrounding a central cavity called the blastocoel,but it lacks these differentiated germ layers.

Column $I$	Column $II$
$(A)$ First month	$(i)$ Separation of eyelids
$(B)$ Second month	$(ii)$ Hairs on head
$(C)$ Fifth month	$(iii)$ Heart
$(D)$ Sixth month	$(iv)$ Limbs and digits

Which structure differentiates the gastrula from the blastula?

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Match the months listed in Column $I$ with the organogenesis of the foetus in Column $II$.
Column $I$ Column $II$
$(A)$ First month $(i)$ Separation of eyelids
$(B)$ Second month $(ii)$ Hairs on head
$(C)$ Fifth month $(iii)$ Heart
$(D)$ Sixth month $(iv)$ Limbs and digits

Human embryo is a solid ball of $16-32$ cells by the end of . . . . . . day after fertilization.

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