Justbecausetheycan'tsingoperaorrideabicycledoesn'tmeanthatanimalsdon'thaveculture. There'snobetterexampleofthisthankillerwhales. Asoneofthemost __26__ predators （食肉动物）, killerwhalesmaynotfitthe __27__ ofaculturedcreature. However, thesebeastsoftheseadodisplayavastrangeofhighly __28__ behaviorsthatappeartobedrivingtheirgeneticdevelopment.
Theword "culture" comesfromtheLatin "colere," which __29__ means "tocultivate." Inotherwords, itreferstoanythingthatis __30__ orlearnt, ratherthaninstinctiveornatural. Amonghumanpopulations, culturenotonlyaffectsthewaywelive, butalsowritesitselfintoourgenes, affectingwhoweare. Forinstance, havingspentmanygenerationshuntingthefatmarinemammalsoftheArctic, theEskimosofGreenlandhavedevelopedcertaingenetic __31__ thathelpthemdigestandutilizethisfat- richdiet, therebyallowingthemto __32__ intheircoldclimate.
Likehumans, killerwhaleshavecolonizedarangeofdifferent __33__ acrosstheglobe, occupyingeveryoceanbasinontheplanetwithanempirethat __34__ frompoletopole. Assuch, differentpopulationsofkillerwhaleshavehadtolearndifferenthuntingtechniquesinordertogaintheupperhandovertheirlocalprey （猎物）. This, inturn, hasamajoreffectontheirdiet, leadingscientiststo __35__ thattheabilitytolearnpopulation-specifichuntingmethodscouldbedrivingtheanimals, geneticdevelopment.
A) acquired
B) adaptations
C) brutal
D) deliberately
E) expressed
F) extends
G) habitats
H) humble
I) image
J) literally
K) refined
L) revolves
M) speculate
N) structure
O) thrive