Which was a result of improved farming techniques and food surpluses? O Complex cities with large buildings sprang up very quickly.
O Some people could focus on different kinds of work.
O Men began to domesticate wild animals.
O Families had fewer children on average.

Complex cities with large buildings sprang up very quickly.

Explanation:

The cities may experience food insecurity because of the development of infrastructure in cities is likely to encourage the rural public to obtain the facilities. The demand of food supplies is likely to increase. The food is basic need which is a area of concern for every person obtaining habitat in the cities. This is responsible for improvement in farming techniques and food surpluses.

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.

c. troops marched forward in close formation against newer, more accurate weapons