Epiboly is the process of

  • A
    Rotation of gastrula within vitelline membrane so that animal pole becomes anterior
  • B
    Overgrowth of micromeres which divide rapidly and spread downward over megameres except at yolk plug
  • C
    Mass migration of cells from animal hemisphere so that upper micromeres migrate over edge of dorsal lip,roll inside and tucked beneath outer layer
  • D
    Formation of small slit like invagination upon grey crescent

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