Revolutions occurred in Europe and the Americas during the 18th & 19th centuries because ? A marginalized groups challenged existing authority
B
ruling classes competed for supremacy with one another.
C
large scale movements against democracy emerged.
D
internal industrialization declined.

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 !

You don’t have to names or other options up here so idk dude