更新时间:2025-08-07 14:28:37
Thereisnoexceptiontotherulethateveryorganicbeingnaturallyincreasesatsohigharate,that,ifnotdestroyed,theearthwouldsoonbecoveredbytheprogenyofasinglepair.Evenslow-breedingmanhasdoubledintwenty-fiveyears,andatthisrate,inlessthanathousandyears,therewouldliterallynotbestandingroomforhisprogeny.
Theelephantisreckonedtheslowestbreederofallknownanimals,andIhavetakensomepainstoestimateitsprobableminimumrateofnaturalincrease;itwillbesafesttoassumethatitbeginsbreedingwhenthirtyyearsold,andgoesonbreedingtillninetyyearsold,bringingforthsixyoungintheinterval,andsurvivingtillonehundredyearsold;ifthisbeso,afteraperiodoffrom740to750yearstherewouldbenearlynineteenmillionelephantsalivedescendedfromthefirstpair.
Canwedoubtthatindividualshavinganyadvantage,howeverslight,overothers,wouldhavethebestchanceofsurvivingandofprocreatingtheirkind?Ontheotherhand,wemayfeelsurethatanyvariationintheleastdegreeinjuriouswouldberigidlydestroyed.Thispreservationoffavorablevariationsandtherejectionofinjuriousvariations,IcallNaturalSelection.
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自然界中每一种有机物都以如此高的速率自然增长,如果没有被破坏,地球很快就会被一对夫妇的后代所覆盖。即使是缓慢的繁殖者在二十五年内也翻了一番,以这种速度,在不到一千年的时间里,他的后代就没有立足之地了。
大象估计所有已知的动物的繁殖速度最慢,我采取了一些痛苦,估计其最低的可能自然增长率;这将是安全的假设,它开始繁殖时三十岁,继续饲养到九十岁,带来了六年轻的间隔,并存活到一百岁;如果是这样,经过一段时间的740至750年将有近一千九百万头大象活着是第一对。
我们可以怀疑的人有优势,但是轻微的,别人,会有最好的机会生存和繁衍的吗?另一方面,我们可以确信,任何程度的伤害都会被严格摧毁。这种保留有利的变化和拒绝有害的变化,我称之为自然选择。
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