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 59
... occurred , that other variations useful in some way to each being in the great and complex battle of life , should occur in the course of many successive generations ? If such do occur , can we doubt. 59 Chapter Four: NATURAL SELECTION ...
... occurred , that other variations useful in some way to each being in the great and complex battle of life , should occur in the course of many successive generations ? If such do occur , can we doubt. 59 Chapter Four: NATURAL SELECTION ...
Página 348
... occur . On the Organ mountains of Brazil , some few temperate European , some Antarctic , and some Andean genera were found by Gardner , which do not exist in the low intervening hot countries . On the Silla of Caraccas , the ...
... occur . On the Organ mountains of Brazil , some few temperate European , some Antarctic , and some Andean genera were found by Gardner , which do not exist in the low intervening hot countries . On the Silla of Caraccas , the ...
Página 363
... occur in many parts of the world on very small islands , when lying close to a continent ; and hardly an island can ... occur on oceanic islands , aerial mammals do occur on almost every island . New Zealand possesses two bats found ...
... occur in many parts of the world on very small islands , when lying close to a continent ; and hardly an island can ... occur on oceanic islands , aerial mammals do occur on almost every island . New Zealand possesses two bats found ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
Derechos de autor | |
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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