Which descriptions are true about a civilization? choose all answers that are correct. a. people organize large projects such as levee-building. b. residents have no need for the herding of domesticated sheep, cattle, or goats. c. a few people are able to produce enough food for everyone. d. farming becomes unimportant in the economy.

Over time, historians have changed the ways they study the past because they have: o a. emphasized the study of oral history passed down in communities for generations. o b. started to explore history through the perspectives of many different groups. c. focused on uncovering archaeological evidence rather than analyzing documents. d. largely abandoned studying comparative and cultural history in favor of microhistory.