This is a picture of a blastula, a growing mass of cells all similar to that of the fertilized egg from which it all started. All but one of the statements are true concerning the blastula. That is Responses Athe cells are growing.the cells are growing. Bthe cells have the same DNA.the cells have the same DNA. Ccell differentiation has begun.cell differentiation has begun. Dthe cells are undergoing mitosis.the cells are undergoing mitosis.