On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2±ÇD. Appleton, 1888 - 458ÆäÀÌÁö |
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2 ÆäÀÌÁö
... seeds that must be transported by certain birds , and which has flowers with separate sexes absolutely requiring the agency of certain . insects to bring pollen from one flower to the other , it is equally preposterous to account for ...
... seeds that must be transported by certain birds , and which has flowers with separate sexes absolutely requiring the agency of certain . insects to bring pollen from one flower to the other , it is equally preposterous to account for ...
6 ÆäÀÌÁö
... seed - capsule . At long intervals of time , out of millions or individuals reared in the same country and fed on nearly the same food , deviations of structure so strongly pronounced as to deserve to be called monstrosities arise ; but ...
... seed - capsule . At long intervals of time , out of millions or individuals reared in the same country and fed on nearly the same food , deviations of structure so strongly pronounced as to deserve to be called monstrosities arise ; but ...
7 ÆäÀÌÁö
... seed ! In some few cases it has been discovered that a very trifling change , such as a little more or less water at some particular period of growth , will determine whether or not a plant will produce seeds . I cannot here give the ...
... seed ! In some few cases it has been discovered that a very trifling change , such as a little more or less water at some particular period of growth , will determine whether or not a plant will produce seeds . I cannot here give the ...
8 ÆäÀÌÁö
... seed . They occur rarely under nature , but are far from rare under culture . As a single bud out of the many thousands , produced year after year on the same tree under uniform conditions , has been known suddenly to assume a new ...
... seed . They occur rarely under nature , but are far from rare under culture . As a single bud out of the many thousands , produced year after year on the same tree under uniform conditions , has been known suddenly to assume a new ...
21 ÆäÀÌÁö
... seeds of the same tree . Innumerable other examples could be given . The explanation , I think , is simple : from long - continued study they are strongly impressed with the differences between the several races ; and though they well ...
... seeds of the same tree . Innumerable other examples could be given . The explanation , I think , is simple : from long - continued study they are strongly impressed with the differences between the several races ; and though they well ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamell©¡ larv©¡ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young