On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCassell, 1909 - 430페이지 |
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32 페이지
... exterminated ; and the common rock - pigeon , which has the same habits with the domestic breeds , has not been exterminated even on several of the smaller British islets , or on the shores of the Mediterranean . Hence the supposed ex ...
... exterminated ; and the common rock - pigeon , which has the same habits with the domestic breeds , has not been exterminated even on several of the smaller British islets , or on the shores of the Mediterranean . Hence the supposed ex ...
56 페이지
... exterminate the parent species ; or both might co - exist , and both rank as independent species . But we shall hereafter have to return to this subject . From these remarks it will be seen that I look at the term species , as one ...
... exterminate the parent species ; or both might co - exist , and both rank as independent species . But we shall hereafter have to return to this subject . From these remarks it will be seen that I look at the term species , as one ...
96 페이지
... exterminated . Unless favourable variations be inherited by some at least of the offspring , nothing can be effected by natural selection . Non- inheritance of any new character is , in fact , the same thing as reversion to the ...
... exterminated . Unless favourable variations be inherited by some at least of the offspring , nothing can be effected by natural selection . Non- inheritance of any new character is , in fact , the same thing as reversion to the ...
100 페이지
... exterminated . Each new form , also , as soon as it has been much improved , will be able to spread over the open and continuous area , and will thus come into competition with many others . Hence more new places will be formed , and ...
... exterminated . Each new form , also , as soon as it has been much improved , will be able to spread over the open and continuous area , and will thus come into competition with many others . Hence more new places will be formed , and ...
101 페이지
... exterminated . And it is in fresh water that we find seven genera of Ganoid fishes , remnants of a once preponderant order : and in fresh water we find some of the most anomalous forms now known in the world , as the Ornithorhynchus and ...
... exterminated . And it is in fresh water that we find seven genera of Ganoid fishes , remnants of a once preponderant order : and in fresh water we find some of the most anomalous forms now known in the world , as the Ornithorhynchus and ...
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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