Over80percentofmankind’sdietisprovidedbytheseedsofles...
問題詳情: Over80percentofmankind’sdietisprovidedbytheseedsoflessthanadozenplantspecies.Buttheamountandvarietyofcropproductionhasbeenincreasingallthetime. ____56____Forexample,Egyptianssettledalo...