On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
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Página 59
... follows from the high rate at which all organic beings tend to increase . Every being , which during its natural lifetime produces several eggs or seeds , must suffer destruction during some period of its life , and during some season ...
... follows from the high rate at which all organic beings tend to increase . Every being , which during its natural lifetime produces several eggs or seeds , must suffer destruction during some period of its life , and during some season ...
Página 93
... follow from this unconscious process of selection , notwithstanding a large amount of crossing with inferior animals . Thus it will be in nature ; for within a confined area , with some place in its polity not so perfectly occupied as ...
... follow from this unconscious process of selection , notwithstanding a large amount of crossing with inferior animals . Thus it will be in nature ; for within a confined area , with some place in its polity not so perfectly occupied as ...
Página 99
... follows that as each selected and favoured form increases in number , so will the less favoured forms decrease and become rare . Rarity , as geology tells us , is the precursor to extinction . We can , also , see that any form repre ...
... follows that as each selected and favoured form increases in number , so will the less favoured forms decrease and become rare . Rarity , as geology tells us , is the precursor to extinction . We can , also , see that any form repre ...
Página 100
... follows , that as new species in the course of time are formed through natural selection , others will become rarer and rarer , and finally extinct . The forms which stand in closest competition with those under- going modification and ...
... follows , that as new species in the course of time are formed through natural selection , others will become rarer and rarer , and finally extinct . The forms which stand in closest competition with those under- going modification and ...
Página 104
... follows what may be called a simultaneous rotation . Most of the animals and plants which live close round any small piece of ground , could live on it ( supposing it not to be in any way peculiar in its nature ) , and may be said to be ...
... follows what may be called a simultaneous rotation . Most of the animals and plants which live close round any small piece of ground , could live on it ( supposing it not to be in any way peculiar in its nature ) , and may be said to be ...
Otras ediciones - Ver todas
On the Origin of Species by Means of Natural Selection: or the Preservation ... Charles Darwin Vista previa limitada - 2023 |
Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely