The event that finally caused south carolina to secede from the union was
james buchanan being elected president
union troops seizing fort sumter from the south
congress rejecting slavery
abraham lincoln being elected president

The event that finally caused South Carolina to secede from the Union was "Abraham Lincoln being elected president," since they believed he was an enemy of slavery. 

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 !