The people from asia who first migrated to the americas came here by crossing the: continental divide pacific ocean bering land bridge land bridge

The people from Asia who first migrated to the Americas came here by crossing the "Bering Land Bridge," which was only possible because during this time the bridge was frozen over, unlike it is now. 

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 !