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 |
Dentro del libro
Resultados 1-3 de 52
Página 51
... climate seems at first sight to be quite independent of the struggle for existence ; but in so far as climate chiefly acts in reducing food , it brings on the most severe struggle between the individuals , whether of the same or of ...
... climate seems at first sight to be quite independent of the struggle for existence ; but in so far as climate chiefly acts in reducing food , it brings on the most severe struggle between the individuals , whether of the same or of ...
Página 114
... climates by man himself and by his domestic animals , and the fact of the extinct elephant and rhinoceros having formerly endured a glacial climate , whereas the living species are now all tropical or sub - tropical in their habits ...
... climates by man himself and by his domestic animals , and the fact of the extinct elephant and rhinoceros having formerly endured a glacial climate , whereas the living species are now all tropical or sub - tropical in their habits ...
Página 344
... climate before the commencement of the Glacial period . At this , the newer Pliocene period , the majority of the inhabitants of the world were specifically the same as now , and we have good reason to believe that the climate was ...
... climate before the commencement of the Glacial period . At this , the newer Pliocene period , the majority of the inhabitants of the world were specifically the same as now , and we have good reason to believe that the climate was ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
Derechos de autor | |
Otras 13 secciones no mostradas
Otras ediciones - Ver todas
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