Primary sources can be described as those sources that are closest to the origin of the information. They contain raw information and thus, must be interpreted by researchers. Secondary sources are closely related to primary sources and often interpret them.
Answer: Disease (economic disruptions) Also keep in mind that bacterica, cancer, tumors etc. were not brought up till the 1980's - 2000's
Explanation: Look at my comment because it got cencored for some reason
One reason that rock layers are not horizontal are because of erosion and it also depends we’re you find the rock layer
Answer:
1, 3, 5
Explanation:
On EDG its the first third and last one
