▁three ▁parts ▁by ▁Harris ; ▁infrastr ucture , ▁structure ▁and ▁super structure . ▁Eric ▁Ald en ▁Smith ▁and ▁Bruce ▁Winter hal der ▁laid ▁the ▁blue print s ▁for ▁the ▁second ▁ground bre aking ▁structure ▁of ▁evolution ary ▁e col ogy . ▁This ▁would ▁shift ▁attention ▁to ▁the ▁individual ▁as ▁the ▁origin ▁of ▁adaptation , ▁stress ing ▁choice ▁when ▁util izing ▁natural ▁resources . ▁A ▁further ▁expansion ▁of ▁e colog ical ▁anth rop ology ▁occurred ▁in ▁the ▁ 1 9 9 0 s ▁when ▁historical , ▁political , ▁and ▁spiritual ▁focused ▁areas ▁of ▁research ▁were ▁incorpor ated ▁into ▁fac ets ▁of ▁human ▁e col ogy ▁and ▁adaptation . ▁ ▁Pur pose ▁ ▁Anth rop ology ▁is ▁a ▁field ▁concerned ▁specifically ▁with ▁the ▁human ▁condition ▁and ▁its ▁relation ▁to ▁the ▁natural ▁world ▁( i . e . ▁the ▁capacity ▁of ▁a ▁human ▁to ▁manipulate ▁the ▁world ▁around ▁them ). ▁This ▁can ▁be ▁seen ▁through ▁human ▁interactions ▁between ▁each ▁other ▁as ▁well ▁as ▁the ▁fl ora ▁and ▁fa una ▁present ▁in ▁a ▁person ' s ▁particular ▁region ▁and ▁how ▁they ▁can ▁be ▁util ized . ▁Hum ans ▁everywhere ▁have ▁changed ▁their ▁environment ▁and ▁for ▁better ▁or ▁for ▁worse , ▁taking ▁a ▁step ▁back ▁to ▁the ▁previous ▁state ▁of ▁things ▁would ▁be ▁a ▁long ▁ar du ous ▁process . ▁So ▁how ▁can ▁people ▁er ase ▁the ▁mistakes ▁of ▁the ▁past ? ▁How ▁can ▁they ▁bring ▁old , ▁out dated ▁things ▁new ▁life ▁through ▁innov ation ? ▁These ▁questions ▁can ▁provide ▁insight ▁into ▁the ▁development ▁of ▁a ▁sub