The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
도서 본문에서
100개의 결과 중 1 - 5개
vi 페이지
... animals and plants - Nature of the checks to increase - Com- petition universal - Effects of Climate - Protection from the number of individuals - Complex relations of all animals and plants throughout nature - Struggle for life most ...
... animals and plants - Nature of the checks to increase - Com- petition universal - Effects of Climate - Protection from the number of individuals - Complex relations of all animals and plants throughout nature - Struggle for life most ...
xvi 페이지
... animals tend to vary in some degree , and , secondly , that agri- culturists improve their domesticated animals by selec- tion ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy ...
... animals tend to vary in some degree , and , secondly , that agri- culturists improve their domesticated animals by selec- tion ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy ...
10 페이지
... animal , and few things more difficult than to get it to breed freely under confine- ment , even when the male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native coun ...
... animal , and few things more difficult than to get it to breed freely under confine- ment , even when the male and female unite . How many animals there are which will not breed , though kept in an almost free state in their native coun ...
11 페이지
... animals under confinement , I may mention that carnivorous ani- mals , even from the tropics , breed in this country pretty freely under confinement , with the exception of the plantigrades or bear family , which seldom produce young ...
... animals under confinement , I may mention that carnivorous ani- mals , even from the tropics , breed in this country pretty freely under confinement , with the exception of the plantigrades or bear family , which seldom produce young ...
13 페이지
... animals can be named which has not in some country drooping ears ; and the view which has been suggested that the drooping is due to disuse of the muscles of the ear , from the animals being seldom much alarmed , seems probable . Many ...
... animals can be named which has not in some country drooping ears ; and the view which has been suggested that the drooping is due to disuse of the muscles of the ear , from the animals being seldom much alarmed , seems probable . Many ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
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