A supporting text may be the opening paragraph of a case study.
the concluding paragraph of a case study.
comparing and contrasting a case study.
a quote providing evidence in a case study.

wood carving remains today the primary sculptural art form of the sub saharan continent. african art history shows the earliest wooden sculptures from the 17th c are attributed to the kuba, central zaire but the earliest surviving sub-saharan sculpture is a zoomorphic head found in 1928 in central angola.

i hope this .

i think economic depression and disrupted trade and commerce