On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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7 페이지
... Individual differences - Doubtful species - Wide ranging , much diffused , and common species vary most -- Species ... individuals - Complex relations of all animals and 7 61 plants throughout nature - Struggle for life most severe between.
... Individual differences - Doubtful species - Wide ranging , much diffused , and common species vary most -- Species ... individuals - Complex relations of all animals and 7 61 plants throughout nature - Struggle for life most severe between.
8 페이지
... individuals of the same species - Circumstances favourable and unfavourable to Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action- Extinction caused by Natural Selection - Divergence of ...
... individuals of the same species - Circumstances favourable and unfavourable to Natural Selection , namely , intercrossing , isolation , number of individuals - Slow action- Extinction caused by Natural Selection - Divergence of ...
15 페이지
... follows from the high geometrical ratio of their increase , will be treated of . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are INTRODUCTION 15.
... follows from the high geometrical ratio of their increase , will be treated of . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are INTRODUCTION 15.
16 페이지
... individuals of each species are born than can possibly survive ; and as , conse- quently , there is a frequently recurring struggle for existence , it follows that any being , if it vary however slightly in any manner profitable to ...
... individuals of each species are born than can possibly survive ; and as , conse- quently , there is a frequently recurring struggle for existence , it follows that any being , if it vary however slightly in any manner profitable to ...
19 페이지
... individuals of the same variety or sub - variety of our older cultivated plants and animals , one of the first points which strikes us , is , that they generally differ more from each other than do the individuals of any one species or ...
... individuals of the same variety or sub - variety of our older cultivated plants and animals , one of the first points which strikes us , is , that they generally differ more from each other than do the individuals of any one species or ...
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely