Which event led to the division of Islam into two main groups? the death of Ali

the rise of the Abbasids

the fall of the Umayyads

the formation of the Sufi
What practices allowed China to feed its growing population?

it is a

Explanation:

Accumulating more land so that your country can continue expanding without running into problems such as overpopulation

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.