The natural vegetation region of sub-saharan africa

"The natural vegetation regions of Africa South of the Sahara correspond closely to the climatic regions, but are becoming increasingly modified by human actions." (page 221)

So the answer would be 

The natural vegetation region of sub-Saharan Africa "are heavily impacted by human activity."

H=   2(area/a+b)h= 2(144/a+b)h= 2(144/18+18)h= 2(144/36)h= 2(4)h=8

Answer meranesia;