At what stage is the primitive streak in the | vedclass

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(B) In the development of a chick embryo,the formation of the primitive streak is a critical event during gastrulation.This process typically begins a

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$18$ hours incubation

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(B) In the development of a chick embryo,the formation of the primitive streak is a critical event during gastrulation.This process typically begins around $16$ to $18$ hours of incubation.By $18$ hours of incubation,the primitive streak is clearly visible as a thickened band of cells along the midline of the epiblast,marking the longitudinal axis of the developing embryo.

At what stage is the primitive streak in the chick embryo formed?

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