On the Origin of Species by Means of Natural Selection: Or the Preservation of Favoured Races in the Struggle for Life |
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Page 124
... accumulated through natural selection , other parts become modified . This is a very important subject , most imperfectly understood . The most obvious case is that modifications accumulated solely for the good of the young or larva ...
... accumulated through natural selection , other parts become modified . This is a very important subject , most imperfectly understood . The most obvious case is that modifications accumulated solely for the good of the young or larva ...
Page 248
... accumulated to any thickness and extent over a shallow bottom , if it continue slowly to subside . In this latter case , as long as the rate of subsidence and supply of sediment nearly balance each other , the sea will remain shallow ...
... accumulated to any thickness and extent over a shallow bottom , if it continue slowly to subside . In this latter case , as long as the rate of subsidence and supply of sediment nearly balance each other , the sea will remain shallow ...
Page 267
... accumulation of long- enduring fossiliferous formations depends on great masses of sediment having been deposited on areas while subsiding , our formations have been almost necessarily accumulated at wide and irregularly intermittent ...
... accumulation of long- enduring fossiliferous formations depends on great masses of sediment having been deposited on areas while subsiding , our formations have been almost necessarily accumulated at wide and irregularly intermittent ...
Contents
INTRODUCTION | 1 |
STRUGGLE FOR EXISTENCE | 52 |
NATURAL SELECTION | 69 |
Copyright | |
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Common terms and phrases
accumulated adapted affinities allied species 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 distant distinct species divergence doubt embryo Europe existing exterminated extinct extremely facts favourable fertility flowers formation forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important increase in number individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner migration modification modified descendants natural selection naturalists nearly nest occasional oceanic islands offspring Origin of Species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemblance seeds sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory tion trees variability variation vary whole widely