The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538ÆäÀÌÁö |
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... become modified and improved , we can understand , on the principle of competition , and from the all - important relations of organism to organism in the struggle for life , that any form which did not become in some degree modified ...
... become modified and improved , we can understand , on the principle of competition , and from the all - important relations of organism to organism in the struggle for life , that any form which did not become in some degree modified ...
389 ÆäÀÌÁö
... become naturalized . But this is no valid argument against what would be effected by occasional means of transport , during the long lapse of geological time , while the island was being upheaved , and before it had become fully stocked ...
... become naturalized . But this is no valid argument against what would be effected by occasional means of transport , during the long lapse of geological time , while the island was being upheaved , and before it had become fully stocked ...
469 ÆäÀÌÁö
... become rudimentary for its proper purpose , and be used for a distinct one : in cer- tain fishes the swim - bladder seems to be rudimentary for its proper function of giving buoyancy , but has become converted into a nascent breathing ...
... become rudimentary for its proper purpose , and be used for a distinct one : in cer- tain fishes the swim - bladder seems to be rudimentary for its proper function of giving buoyancy , but has become converted into a nascent breathing ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamell©¡ larv©¡ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion variability variations varieties vary whole widely different wings young