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7.What are the characteristics of mammalian early cleavage?
9.What was the role of zona pellucida during fertilization? What is the role ofzona pellucida during implantation of mammalian embryo? When and whydoes it have to shed?10.What is the role of trophoblast during embryonic implantation? What are the two types of trophoblast cells and what is their role in implantation? Is trophoblast going to give rise to any embryonic tissue? What is chorion?.