▁the ▁book , ▁and ▁also ▁a ▁musical ▁instrument ▁power ed ▁by ▁a ▁hand - c rank . ▁ ▁References ▁ ▁External ▁links ▁▁▁ ▁Charles ▁Am irk han ian ▁inter views ▁Tr imp in ▁May ▁ 1 7 , ▁ 1 9 9 0 ▁( on ▁the ▁Internet ▁Archive ). ▁ ▁Category : 1 9 5 1 ▁birth s ▁Category : L iving ▁people ▁Category : Mac Ar thur ▁F ell ows ▁Category : Mus icians ▁from ▁Seattle ▁Category : Art ists ▁from ▁Seattle ▁Category : American ▁male ▁compos ers ▁Category : 2 1 st - century ▁American ▁compos ers ▁Category : G erman ▁sculpt ors ▁Category : G erman ▁male ▁sculpt ors ▁Category : G erman ▁compos ers ▁Category : S cul pt ors ▁from ▁Washington ▁( state ) <0x0A> </s> ▁In ▁bi ology , ▁two ▁related ▁species ▁or ▁populations ▁are ▁considered ▁sym pat ric ▁when ▁they ▁exist ▁in ▁the ▁same ▁ge ographic ▁area ▁and ▁thus ▁frequently ▁encounter ▁one ▁another . ▁An ▁initially ▁inter bre eding ▁population ▁that ▁spl its ▁into ▁two ▁or ▁more ▁distinct ▁species ▁sharing ▁a ▁common ▁range ▁exempl ifies ▁sym pat ric ▁spe ci ation . ▁Such ▁spe ci ation ▁may ▁be ▁a ▁product ▁of ▁re product ive ▁isol ation   – ▁which ▁prevents ▁hy brid ▁off spring ▁from ▁being ▁vi able ▁or ▁able ▁to ▁reproduce , ▁thereby ▁reducing ▁gene ▁flow   – ▁that ▁results ▁in ▁gen etic ▁diver gence . ▁Sym pat ric ▁spe ci ation ▁does ▁not ▁imply ▁secondary ▁contact , ▁which ▁is ▁spe ci ation ▁or ▁diver