The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page 79
... Increase . A struggle for existence inevitably 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 ...
... Increase . A struggle for existence inevitably 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 ...
Page 80
... increase ; it will be safest to assume that it begins breeding when thirty years old , and goes on breeding till ninety years old , bringing forth six young in the interval , and surviving till one hundred years old ; if this be so ...
... increase ; it will be safest to assume that it begins breeding when thirty years old , and goes on breeding till ninety years old , bringing forth six young in the interval , and surviving till one hundred years old ; if this be so ...
Page 81
... increase , the result of which never fails to be surprising , simply explains their ex- traordinarily rapid increase and wide diffusion in their new homes . In a state of nature almost every full - grown plant annually produces seed ...
... increase , the result of which never fails to be surprising , simply explains their ex- traordinarily rapid increase and wide diffusion in their new homes . In a state of nature almost every full - grown plant annually produces seed ...
Page 82
... increase in number . But the real importance of a large number of eggs or seeds is to make up for much destruction at some period of life ; and this period in the great majority of cases is an early one . If an animal can in any way ...
... increase in number . But the real importance of a large number of eggs or seeds is to make up for much destruction at some period of life ; and this period in the great majority of cases is an early one . If an animal can in any way ...
Page 83
... Increase . The causes which check the natural tendency of each species to increase are most obscure . Look at the most vigorous species ; by as much as it swarms in numbers , by so much will it tend to increase still further . We know ...
... Increase . The causes which check the natural tendency of each species to increase are most obscure . Look at the most vigorous species ; by as much as it swarms in numbers , by so much will it tend to increase still further . We know ...
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Common terms and phrases
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young