Nimegundua.....

this theory is the dumpiest i've ever heard. Please substantiate it otherwise.....
 
this theory is the dumpiest i've ever heard. Please substantiate it otherwise.....

try to compare level of development btn regions;
europe(temperate)
asia/arab(arid or semiarid)
south sahara(tropic)
nadhani utakubaliana na theory hii.
 
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