On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 77
... terrestrial species are hermaphrodites , such as the land - mollusca and earth - worms ; but these all pair . As yet I have not found a single terrestrial animal which can fertilise itself . This remarkable fact , which offers so strong ...
... terrestrial species are hermaphrodites , such as the land - mollusca and earth - worms ; but these all pair . As yet I have not found a single terrestrial animal which can fertilise itself . This remarkable fact , which offers so strong ...
Página 185
... terrestrial carnivorous animals of considerable size , and bats into terrestrial insectivorous animals ; for the former there would be no prey ; for the bats ground - insects would serve as food , but these would already be largely ...
... terrestrial carnivorous animals of considerable size , and bats into terrestrial insectivorous animals ; for the former there would be no prey ; for the bats ground - insects would serve as food , but these would already be largely ...
Página 363
... terrestrial mammal ( excluding domesticated animals kept by the natives ) inhabiting an island situated above 300 miles from a continent or great continental island ; and many islands situated at a much less distance are equally barren ...
... terrestrial mammal ( excluding domesticated animals kept by the natives ) inhabiting an island situated above 300 miles from a continent or great continental island ; and many islands situated at a much less distance are equally barren ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase 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 occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young