人工智能的思维导图

Afterthearrivalofhunter-gatherersinthesouthwesternregionofNorthAmerica,severalalternativetypesofagricultureemerged,allinvolvingdifferentsolutionstotheSouthwest’sfundamentalproblem:howtoobtainenoughwatertogrowcropsinanenvironmentinwhichrainfallissolowandunpredictablethatlittleornofarm