The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeF. Ungar Publishing Company, 1956 - 134페이지 |
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11개의 결과 중 1 - 3개
33 페이지
... areas , though now continuous , will often , owing to former oscillations of level , have existed in a broken condition ; so that the good effects of isola- tion will generally , to a certain extent , have occurred . Finally ...
... areas , though now continuous , will often , owing to former oscillations of level , have existed in a broken condition ; so that the good effects of isola- tion will generally , to a certain extent , have occurred . Finally ...
88 페이지
... areas of subsidence , the great archipelagos still areas of oscillations of level , and the continents , areas of elevation . But at a period long antecedent to the Cambrian epoch , continents may have existed where oceans now are ; and ...
... areas of subsidence , the great archipelagos still areas of oscillations of level , and the continents , areas of elevation . But at a period long antecedent to the Cambrian epoch , continents may have existed where oceans now are ; and ...
96 페이지
... areas mean ? He would be a bold man who , after comparing climates , would attempt to account through physical con- ditions for the similarity or dissimilarity of the inhabitants . On the theory of descent with modification , the great ...
... areas mean ? He would be a bold man who , after comparing climates , would attempt to account through physical con- ditions for the similarity or dissimilarity of the inhabitants . On the theory of descent with modification , the great ...
목차
Variation under Domestication | 1 |
Variation under Nature | 12 |
Struggle for Existence | 19 |
저작권 | |
표시되지 않은 섹션 9개
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accumulated adapted affinity allied species animals aphides appear areas become believe birds breeds Cambrian characters CHARLES DARWIN climate closely allied common continent crossed crustaceans cuckoo Darwin degree descended developed difficulty distinct species disuse domestic effects eggs embryo embryology eminently liable existing extermination extinct extremely fact favourable females fertilised fertility flower formations fossil genera genus geological geological period giraffe gradations greater number groups habits Hence hybrids hybrids produced important increase individuals inhabitants inheritance insects instance instincts intercrossing intermediate intervals islands larvae less living males mammals manner Marsupials migration Mivart modification natural selection naturalists nearly nest neuters occasional offspring organisation Origin of Species parent perfect pigeon plants pollen probably produced progenitor pupae quadrupeds rank reciprocal crosses reproductive systems resemblance rock-pigeon rudimentary organs seeds sexual selection slaves slight stage sterility structure struggle swimbladder tend tendency theory of natural tion variability variations varieties vary widely young