In the united states, conflict between protestants and irish catholic immigrants resulted in much violence.

Yes, it is true that in the US conflict between Protestants and Irish Catholic immigrants resulted in much violence, since the Protestants considered themselves to be "nativists," who fought against Catholic immigration because they felt Catholics were degrading society. 

Hi! after fertilization occurs, the zygote goes through mitosis and then differentiation (aka specialization of cells) to have a variety of cells that perform different functions. this allows for the creation of tissues and so on, all of which were once stem cells with no specific function.i hope i !