What were the major patterns of native american life in north america before europeans arrived?

Before the Europeans arrived in North America, the Native Americans’ life revolved around routines which kept their lives intact and organized. They were engaged in hunting and gathering. They were also into the foundation of social- structure-technology and introduction of trade and market place-economy.  When the Europeans arrived, North America already had cities, roads, and systems for their irrigation, trade networks which were already extensive and other infrastructures. But then, North American Indians still lacked back then the technology the Europeans had like the mental tools and machines, gunpowder, and for navigation when it came to long distance, the knowledge on how to deal with it. 

the answer for 3 is b and the answer for 4 is d

the han greatly expands the chinese empire. the han dynasty retains the centralized bureaucracy and unified political system of the qin but adopts and grafts upon this the confucian view that government should be run by educated, ethical men.

explanation: