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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10개의 결과 중 1 - 3개
97 페이지
... migration are related in a close and important manner to the differ- ences between the productions of various regions . We I see this in the New and Old Worlds , excepting in the northern parts , where the land almost joins , and where ...
... migration are related in a close and important manner to the differ- ences between the productions of various regions . We I see this in the New and Old Worlds , excepting in the northern parts , where the land almost joins , and where ...
98 페이지
... migration of the more dominant forms having been more or less effectually prevented , at periods more or less remote ... migrated over vast spaces , and have not become greatly or at all modified . Species of the same genus , though ...
... migration of the more dominant forms having been more or less effectually prevented , at periods more or less remote ... migrated over vast spaces , and have not become greatly or at all modified . Species of the same genus , though ...
99 페이지
... migration , and calls in the agency of miracle . In most cases the area inhabited by a species is continuous . The incapacity of migrating across a wide sea is more clear in the case of terrestrial mammals than with other organic beings ...
... migration , and calls in the agency of miracle . In most cases the area inhabited by a species is continuous . The incapacity of migrating across a wide sea is more clear in the case of terrestrial mammals than with other organic beings ...
목차
Variation under Domestication | 1 |
Variation under Nature | 12 |
Struggle for Existence | 19 |
저작권 | |
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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