Which of the following statements supports the position that using human stem cells for scientific research is ethical?I.Harvesting embryonic cells can advance scientific understanding of cell differentiation.II.An embryo has not yet developed its nervous system; therefore, the process of harvesting stem cells is painless.III.Many embryos made through the process of IVF are never implanted and would otherwise be discarded.A. I and IIB. II and IIIC. I and IIID. I, II and III

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