aval anche ' ▁effect ... ▁One ▁particular ▁kind ▁of ▁positive ▁feedback ▁occurs ▁when ▁individuals ▁OF ▁THE ▁SA ME ▁S PE CI ES ▁enter ▁into ▁competition ▁among ▁themselves ... ▁For ▁many ▁animal ▁species , ▁environmental ▁factors ▁keep ... ▁in tras pecies ▁selection ▁from ▁[ leading ▁to ] ▁dis aster ... ▁But ▁there ▁is ▁no ▁force ▁which ▁exer cis es ▁this ▁type ▁of ▁health y ▁regul atory ▁effect ▁on ▁human ity ' s ▁cultural ▁development ; ▁unfortunately ▁for ▁itself , ▁human ity ▁has ▁learned ▁to ▁overcome ▁ ▁all ▁those ▁environmental ▁forces ▁which ▁are ▁external ▁to ▁itself ▁p 4 4 . ▁ ▁Regarding ▁ag gression ▁in ▁human ▁be ings , ▁Lor enz ▁states : ▁ ▁Let ▁us ▁imagine ▁that ▁an ▁absolutely ▁un bi ased ▁investig ator ▁on ▁another ▁planet , ▁perhaps ▁on ▁Mars , ▁is ▁exam ining ▁human ▁behavior ▁on ▁earth , ▁with ▁the ▁aid ▁of ▁a ▁teles cope ▁whose ▁magn ification ▁is ▁too ▁small ▁to ▁enable ▁him ▁to ▁disc ern ▁individuals ▁and ▁follow ▁their ▁separate ▁behavior , ▁but ▁large ▁enough ▁for ▁him ▁to ▁observe ▁occurr ences ▁such ▁as ▁migr ations ▁of ▁pe op les , ▁wars , ▁and ▁similar ▁great ▁historical ▁events . ▁He ▁would ▁never ▁gain ▁the ▁impression ▁that ▁human ▁behavior ▁was ▁dict ated ▁by ▁intelligence , ▁still ▁less ▁by ▁responsible ▁mor ality . ▁If ▁we ▁suppose ▁our ▁extr aneous ▁observer ▁to ▁be ▁a ▁being ▁of ▁pure ▁reason , ▁de void ▁of ▁instinct s ▁himself ▁and ▁una ware ▁of ▁the ▁way ▁in ▁which ▁all ▁instinct s ▁in ▁general ▁and ▁ag gression ▁in ▁particular ▁can