Natural unemployment equals unemployment plus unemployment. frictional; cyclical frictional; structural cyclical; structural frictional; structural unemployment plus cyclical

I believe the answer is: frictional; structural
Frictional unemployment refers to the type of unemployment that created due to transition that make a person moves from one job to another.
Structural unemployment refers to the type of unemployment that created due to the mismatch of skills between the workers and the job.

Both the han and the roman empire decline as a result of social unrest during their collapse.

Water(like when there is a hurricane)some foods(not enough for everyone)