On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454ÆäÀÌÁö |
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22 ÆäÀÌÁö
... become wild or feral , though the dovecot - pigeon , which is the rock - pigeon in a very slightly altered state , has become feral in several places . Again , all recent experience shows that it is most difficult to get any wild animal ...
... become wild or feral , though the dovecot - pigeon , which is the rock - pigeon in a very slightly altered state , has become feral in several places . Again , all recent experience shows that it is most difficult to get any wild animal ...
24 ÆäÀÌÁö
... become less and less , as in each succeeding genera- tion there will be less of the foreign blood ; but when there has been no cross with a distinct breed , and there is a tendency in both parents to revert to a char- acter , which has ...
... become less and less , as in each succeeding genera- tion there will be less of the foreign blood ; but when there has been no cross with a distinct breed , and there is a tendency in both parents to revert to a char- acter , which has ...
36 ÆäÀÌÁö
... become through long - continued , partly unconscious and partly methodical selection . Perhaps the parent bird of all fantails had only fourteen tail - feathers some- what expanded , like the present Java fantail , or like individuals ...
... become through long - continued , partly unconscious and partly methodical selection . Perhaps the parent bird of all fantails had only fourteen tail - feathers some- what expanded , like the present Java fantail , or like individuals ...
48 ÆäÀÌÁö
... become extinct , or they may endure as varieties for very long periods , as has been shown to be the case by Mr. Wollaston with the varieties of certain fossil land - shells in Madeira . If a variety were to flourish so as to exceed in ...
... become extinct , or they may endure as varieties for very long periods , as has been shown to be the case by Mr. Wollaston with the varieties of certain fossil land - shells in Madeira . If a variety were to flourish so as to exceed in ...
49 ÆäÀÌÁö
... become exposed to diverse physical conditions , and as they come into competition ( which , as we shall hereafter see , is a far more important circumstance ) with different sets of organic beings . But my tables further show that , in ...
... become exposed to diverse physical conditions , and as they come into competition ( which , as we shall hereafter see , is a far more important circumstance ) with different sets of organic beings . But my tables further show that , in ...
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accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larv©¡ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely