The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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56 페이지
... tend to become con- verted into new and distinct species . Thus the larger genera tend to become larger ; and throughout nature the forms of life which are now dominant tend to become still more dominant by leaving many modified and ...
... tend to become con- verted into new and distinct species . Thus the larger genera tend to become larger ; and throughout nature the forms of life which are now dominant tend to become still more dominant by leaving many modified and ...
122 페이지
... tend generally to spread very widely , consequently they will tend to supplant and exter- minate several species in several areas , and thus check the inordinate increase of specific forms throughout the world . Dr. Hooker has recently ...
... tend generally to spread very widely , consequently they will tend to supplant and exter- minate several species in several areas , and thus check the inordinate increase of specific forms throughout the world . Dr. Hooker has recently ...
371 페이지
... tend to leave many modified descend- ants , which form new sub - groups and groups . As these are formed , the species of the less vigorous groups , from their inferiority inherited from a common progenitor , tend to become extinct ...
... tend to leave many modified descend- ants , which form new sub - groups and groups . As these are formed , the species of the less vigorous groups , from their inferiority inherited from a common progenitor , tend to become extinct ...
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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 domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest 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