阅读理解A
题干：Beingamanhasalwaysbeendangerous.Thereareabout105malesbornforevery100females,butthisratiodropstonearbalanceattheageofmaturity,andamong70-year-oldstherearetwiceasmanywomenasmen.Butthegreatuniversalofmalemortalityisbeingchanged.Now,boybabiessurvivealmostaswellasgirlsdo.Thismeansthat，forthefirsttime，therewillbeanexcessofboysinthosecrucialyearswhentheyaresearchingforamate.Moreimportant，anotherchancefornaturalselectionhasbeenremoved.Fiftyyearsago,thechanceofababy(particularlyaboybaby)survivingdependedonitsweight.Akilogramtoolightortooheavymeantalmostcertaindeath.Todayitmakesalmostnodifference.Sincemuchofthevariationisduetogenes,onemoreagentofevolutionhasgone.Thereisanotherwaytocommitevolutionarysuicide：stayalive,buthavefewerchildren.Fewpeopleareasfertileasinthepast.Exceptinsomereligiouscommunities,veryfewwomenhas15children.Nowadaysthenumberofbirths,liketheageofdeath,hasbecomeaverage.Mostofushaveroughlythesamenumberofoffspring.Again,differencesbetweenpeopleandtheopportunityfornaturalselectiontotakeadvantageofithavediminished.Indiashowswhatishappening.Thecountryofferswealthforafewinthegreatcitiesandpovertyfortheremainingtribalpeoples.Thegrandmediocrityoftoday-everyonebeingthesameinsurvivalandnumberofoffspring-meansthatnaturalselectionhaslost80%ofitspowerinupper-middle-classIndiacomparedtothetribes.Forus,thismeansthatevolutionisover;thebiologicalUtopiahasarrived.Strangely,ithasinvolvedlittlephysicalchange.Nootherspeciesfillssomanyplacesinnature.Butinthepast100000years-eventhepast100years-ourliveshavebeentransformedbutourbodieshavenot.Wedidnotevolve，becausemachinesandsocietydiditforus.Darwinhadaphrasetodescribethoseignorantofevolution：they“lookatanorganicbeingasasavagelooksataship，asatsomethingwhollybeyondhiscomprehension."Nodoubtwewillremembera20thcenturywayoflifebeyondcomprehensionforitsugliness.ButhoweveramazedourdescendantsmaybeathowfarfromUtopiawewere，theywilllookjustlikeus.
题目：What does the example of India illustrate?
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