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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88 ÆäÀÌÁö
... certain flowers , which with a very little more trouble they can enter by the mouth . Bearing such facts in mind , it may be believed that under certain circumstances individual differences in the curvature or length of the probocis ...
... certain flowers , which with a very little more trouble they can enter by the mouth . Bearing such facts in mind , it may be believed that under certain circumstances individual differences in the curvature or length of the probocis ...
302 ÆäÀÌÁö
... certain South American indigenous domestic dogs do not readily unite with European dogs , the explanation which will occur to every one , and probably the true one , is that they are descended from aboriginally distinct species ...
... certain South American indigenous domestic dogs do not readily unite with European dogs , the explanation which will occur to every one , and probably the true one , is that they are descended from aboriginally distinct species ...
412 ÆäÀÌÁö
... certain whole classes , and their places are occupied by other classes ; thus in the Galapagos Islands reptiles , and in New Zealand gigantic wingless birds , take , or recently took , the place of mammals . Although New Zealand is here ...
... certain whole classes , and their places are occupied by other classes ; thus in the Galapagos Islands reptiles , and in New Zealand gigantic wingless birds , take , or recently took , the place of mammals . Although New Zealand is here ...
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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