During chick gastrulation, what germ-layer regions remain external and do not move inward?

Opaca and Marginal zone stays outer and does not move during chick gastrulation, The zone opaca is a thick fringe ring comprising of more than one cell, it is joined to the germ wall. The Marginal zone lies at the fringe between the range opaca and the region pellucida

B. to increase the amount of antibiotics in the body

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