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- what is the process which involves in the self-destruction of cells in the developing embryo as shown in the disappearance of the embryo’s tail?What determines the antero-posterior polarity in vertebrate embryos?Ectodermal Derivatives of the Developing Chick Embryo A. 33-hour Chick Embryo Transverse Sections B. 48-hour Chick Embryo Transverse Sections C. 72-hour Chick Embryo Transverse Sections QUESTIONS: Is the sulcus limitans present at the 72-hour stage? State the derivatives of the sacculus and
