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 78
... period of life , tend to reappear in the offspring at the same period ; -for in- stance , in the seeds of the many varieties of our culinary and agricultural plants ; in the caterpillar and cocoon stages of the varieties of the silkworm ...
... period of life , tend to reappear in the offspring at the same period ; -for in- stance , in the seeds of the many varieties of our culinary and agricultural plants ; in the caterpillar and cocoon stages of the varieties of the silkworm ...
Página 79
... period of life , shall not be in the least degree injurious : for if they became so , they would cause the extinction of the species . Natural selection will modify the structure of the young in relation to the parent , and of the ...
... period of life , shall not be in the least degree injurious : for if they became so , they would cause the extinction of the species . Natural selection will modify the structure of the young in relation to the parent , and of the ...
Página 92
... period of profitable variations , will compensate for a lesser amount of variability in each individual , and is , I believe , an extremely important element of success . Though nature grants vast periods of time for the work of natural ...
... period of profitable variations , will compensate for a lesser amount of variability in each individual , and is , I believe , an extremely important element of success . Though nature grants vast periods of time for the work of natural ...
Página 97
... periods in a broken condition , is the most favourable for the production of many new forms_of life , likely to endure long and to spread widely . For the area first existed as a continent , and the inhabitants , at this period numerous ...
... periods in a broken condition , is the most favourable for the production of many new forms_of life , likely to endure long and to spread widely . For the area first existed as a continent , and the inhabitants , at this period numerous ...
Página 100
... period favourable variations . We have evidence of this , in the facts given in the second chapter , showing that it is the common species which afford the greatest number of recorded varieties , or incipient species . Hence , rare ...
... period favourable variations . We have evidence of this , in the facts given in the second chapter , showing that it is the common species which afford the greatest number of recorded varieties , or incipient species . Hence , rare ...
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